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"The current cease-fire is fragile—and the only path to lasting peace is diplomacy, not another cycle of American military escalation," one campaigner stressed after lawmakers refused to advance the resolution.
Nearly all U.S. Senate Republicans and Democratic Sen. John Fetterman of Pennsylvania on Friday evening blocked a resolution that reiterated Congress' authority to declare war and would have ordered President Donald Trump to stop taking military action against Iran without congressional approval.
Every other member of the Democratic Caucus and Sen. Rand Paul (R-Ky.) supported holding a final vote on the resolution—which Sen. Tim Kaine (D-Va.), a member of the Senate Armed Services and Foreign Relations committees, announced last week, before Trump's weekend bombing of Iranian nuclear facilities.
"We commend Sen. Kaine for his steadfast leadership in bringing this resolution, and the U.S. senators who stood on the right side of history today in safeguarding against yet another senseless war."
Citing the U.S. Constitution and the War Powers Resolution of 1973, Kaine's measure states that "the question of whether United States forces should be engaged in hostilities against Iran should be answered following a full briefing to Congress and the American public of the issues at stake, a public debate in Congress, and a congressional vote."
Pointing to various other federal laws, Kaine's resolution "directs the president to terminate the use of United States Armed Forces for hostilities against the Islamic Republic of Iran or any part of its government or military, unless explicitly authorized by a declaration of war or specific authorization for use of military force against Iran."
In a statement after Friday's 47-53 vote, Kaine said that "the Framers of our Constitution gave Congress the power to declare war because they believed that the decision to send our nation's men and women in uniform into harm's way was too big for any one person. The Trump administration's chaotic strategy on Iran confused the American people and created significant risks for service members and their families."
"I am disappointed that many of my colleagues are not willing to stand up and say Congress needs to be part of a decision as important as whether or not the U.S. should send our nation's sons and daughters to fight against Iran," Kaine added. "I will continue to do all I can to keep presidents of any party from starting wars without robust public debate by Congress."
Sen. Bernie Sanders (I-Vt.), who caucuses with Democrats, was among the lawmakers who spoke in support of Kaine's resolution ahead of the vote. "We do not need another unnecessary and costly war. We have had enough of them," he said on the Senate floor, pointing out that the Vietnam War and the U.S. invasion of Iraq were "based on a series of lies."
"We should not go to war against Iran," Sanders declared. He condemned Trump's recent attack on the Middle Eastern country as "unconstitutional," and argued that "diplomacy is a better path," as demonstrated by the nuclear deal in 2015—which Trump ultimately ditched during his first term.
Sanders also made the case that the U.S. should not be allied with "war criminal" Israeli Prime Minister Benjamin Netanyahu, who started the bombing of Iran and is wanted by the International Criminal Court for his mass slaughter of Palestinians in the Gaza Strip.
"Enough is enough," the senator said, noting that the U.S. gives Netanyahu's government billions of dollars in annual military aid. "It is beyond absurd that we continue to finance Israel's wars while neglecting the needs of our own people."
Meanwhile, in response to a question from a BBC reporter on Friday, Trump said that he would "without question, absolutely" consider bombing Iran again if intelligence suggested the country could enrich uranium to a level that concerned him.
After the Senate vote, National Iranian American Council president Jamal Abdi said that the outcome "says more about the makeup of the Senate than it does the merits of the resolution. Regardless, we saw a near majority do the right thing and stand up against war and for democracy, despite a cavalcade of misinformation from war hawks. We will continue to press the case that war with Iran is against U.S. interests and U.S. security, and redouble our work to prevent the conflict from reigniting."
"We commend Sen. Kaine for his steadfast leadership in bringing this resolution, and the U.S. senators who stood on the right side of history today in safeguarding against yet another senseless war," he continued, noting the cease-fire between Israel and Iran that Trump announced earlier this week.
"Though a cease-fire is holding for now, the most certain way to guarantee peace is through an abandonment of war and a bold pursuit of sincere negotiations," Abdi added. "We urge our Members of Congress to change course, and urgently support a return to U.S.—Iran talks and a diplomatic pathway forward for both countries."
We took an oath to defend the Constitution - just like every Senator. Today, Republicans broke that oath. We WILL hold them accountable. (2/2)
— VoteVets (@votevets.org) June 27, 2025 at 7:09 PM
Also responding to the Friday development in a statement, Demand Progress senior policy adviser Cavan Kharrazian asserted that "today's vote sends a powerful message: There is a bipartisan movement to reject more war in the Middle East and prevent us from being unilaterally dragged into war before Congress and the American people can have their say."
"We thank Sen. Kaine for his leadership and Sen. Paul for his principled vote to stand up for the Constitution," Kharrazian said, urging the House of Representatives to pass a similar resolution led by Reps. Thomas Massie (R-Ky.) and Ro Khanna (D-Calif.).
Ahead of the Senate's vote, more than 41,000 people nationwide had signed a petition from the progressive group MoveOn Civic Action that calls on Congress to vote for the resolutions in both chambers.
"The current cease-fire is fragile—and the only path to lasting peace is diplomacy, not another cycle of American military escalation," Kharrazian emphasized. "The U.S. must lead with restraint, not repeat the mistakes of endless war."
More than 41,000 people have signed a petition calling on Congress to invoke the War Powers Act to limit Trump's ability to strike Iran without congressional authorization.
The U.S. Senate will vote Friday evening on whether to invoke the War Powers Act, limiting President Donald Trump's ability to launch a war with Iran.
With the vote looming, anti-war groups are turning up the pressure, urging their senators to reassert Congress's ability to check the president's power after he unilaterally inserted the U.S. into Israel's war with Iran by launching airstrikes on three Iranian nuclear sites last weekend.
More than 41,000 people have signed a petition launched by the progressive group MoveOn Civic Action, which calls on Congress to vote for the resolutions introduced in both the House and Senate in recent weeks.
"By launching strikes on Iran without congressional approval, Trump endangered civilians in the U.S. and around the world, while dragging our country closer to another endless war," said MoveOn spokesperson Britt Jacovich. "Congress has a responsibility to the people who elected them to check this abuse of power and take urgent action to prevent the U.S. from being pulled into another deadly and costly conflict."
The vote on the Senate resolution, introduced by Sen. Tim Kaine (D-Va.), will take place Friday at 6:00 pm Eastern time. A vote on the House resolution introduced by Reps. Ro Khanna (D-Calif.) and Thomas Massie (R-Ky.) has not yet been scheduled.
The War Powers resolution, which would require Trump to receive congressional approval for future strikes on Iran, has overwhelming support from Senate Democrats. However, according to reporting from Punchbowl News Friday, Sen. John Fetterman (D-Pa.), a notorious pro-Israel hawk, is expected to vote no.
If all other Democrats vote yes, they'd still need five Republicans to join them. The libertarian Sen. Rand Paul (R-Ky.) has also signaled his support for the resolution. But the rest, including seven who voted for a similar resolution in 2020, have remained tight-lipped about Friday's vote.
The majority of Americans, 56%, said they disapproved of Trump's weekend strikes against Iran in a YouGov poll published Tuesday. They are even more strongly opposed to further escalations, with 84% saying in a Reuters/Ipsos poll that closed Monday that they were worried about growing conflict between the U.S. and Iran.
On Monday, Trump announced that a cease-fire had been brokered between Israel and Iran. But with the two countries accusing one another of violating the truce, doubt remains about whether it will hold.
Cavan Kharrazian, a senior policy advisor for the group Demand Progress, said that uncertainty is all the more reason Congress must assert itself to stop further escalations from the United States.
"In just days, we've gone from a supposed two-week decision window to immediate U.S. airstrikes, a brief cease-fire, Israel and Iran trading fire again, and now another fragile pause," Kharrazian said. "We strongly support diplomatic efforts to end this crisis—but Congress can't sit back and hope for the best while the risk of U.S. involvement in unauthorized hostilities remains."
"The president does not have the power to unilaterally declare war," asserted Rep. Summer Lee. "Congressional authorization isn't optional."
Numerous House progressives said Tuesday that they will support legislation that would force President Donald Trump to obtain congressional permission to wage war on Iran, a development that followed Monday's introduction of two Senate measures aimed at stopping Trump from dragging the United States into the widening Israel-Iran war.
Reps. Thomas Massie (R-Ky.) and Ro Khanna (D-Calif.) on Tuesday introduced legislation affirming the legal requirement under the War Powers Resolution of 1973—also known as the War Powers Act—for the president to notify lawmakers within 48 hours of committing troops to military action and limiting such action to 60 days, with a 30-day withdrawal period, unless Congress declares war or issues an authorization for the use of military force.
"The Constitution does not permit the executive branch to unilaterally commit an act of war against a sovereign nation that hasn't attacked the United States," Massie explained in a statement. "Congress has the sole power to declare war against Iran. The ongoing war between Israel and Iran is not our war. Even if it were, Congress must decide such matters according to our Constitution."
In a post on the social media site X, Massie thanked the resolution's co-sponsors, all of them Democrats: Don Beyer (Va.), Greg Casar (Texas), Alexandria Ocasio-Cortez (N.Y.), Lloyd Doggett (Texas), Jesús "Chuy" García (Ill.), Val Hoyle (Ore.), Pramila Jayapal (Wash.), Summer Lee (Pa.), Jim McGovern (Mass.), Ilhan Omar (Minn.), Ayanna Pressley (Mass.), Delia Ramirez (Ill.), Rashida Tlaib (Mich.), and Nydia Velazquez (N.Y.).
More lawmakers—possibly including Republicans—are expected to sign on to the measure.
"The president does not have the power to unilaterally declare war. Congressional authorization isn't optional," Lee said on social media. "When some profit both financially and politically from endless war, the rest of us pay the price. We can't let them lie us into another conflict that will cost innocent lives."
Tlaib asserted that "the American people aren't falling for it again. We were lied to about 'weapons of mass destruction' in Iraq that killed millions [and] forever changed lives."
The progressive political action committee Justice Democrats welcomed Massie's measure: "Here's an opportunity for bipartisanship that doesn't sell out the American people. Every member of Congress should oppose U.S. involvement, funding, weapons, or troops fighting another endless war in the Middle East."
The House proposal follows Monday's introduction of a war powers resolution by Sen. Tim Kaine (D-Va.) and bill by Sen. Bernie Sanders (I-Vt.) that would prevent the Trump administration from using federal funds for a military attack on Iran without congressional approval. It also echoes a 2020 resolution proposed in the then-Democrat-controlled House that would have banned Trump from waging war on Iran without lawmakers' approval.
Explaining her support for Massie's legislation, Omar said, "I support this resolution because the American people do not want another war."
Indeed, an Economist/YouGov poll published Tuesday revealed that only 16% of surveyed voters "think the U.S. should get involved in the conflict between Israel and Iran." Just 10% of respondents who voted for former Vice President Kamala Harris last year and 19% of 2024 Trump voters want the U.S. to wage war on Iran, as do 15% of self-described Democrats, 11% of Independents, and 23% of Republicans.
A separate survey commissioned by Demand Progress and conducted by the Bullfinch Group recently found that 53% of registered voters—including 58% of Democrats, 47% of Independents, and 56% of Republicans—want Trump to "obtain congressional authorization before striking targets in other countries."
"We applaud Rep. Massie and Sen. Kaine for introducing these resolutions to keep us out of yet another war in the Middle East," Demand Progress senior policy adviser Cavan Kharrazian said Tuesday. "It should be in the interest of Republicans and Democrats to uphold the Constitution and prevent Israel from dragging us into a disastrous war with Iran."
"The American people, including a clear majority of Republican voters, believe the president must obtain congressional authorization before initiating strikes against another country," Kharrazian added. "Congress must listen to them and reassert its constitutional war powers authority by passing these resolutions."
Israel claims it attacked Iran to stop it from obtaining nuclear weapons. However, successive U.S. intelligence assessments have concluded for decades—most recently in March—that Iran is not trying to build nukes. On Tuesday, Trump brushed off his own director of national intelligence's findings that Iran is not close to having a nuclear bomb.
As Trump ratcheted up his cryptic threats against Tehran amid ongoing Israeli attacks on Iran and Iranian counterstrikes, anti-war voices including the National Iranian American Council (NIAC) and the peace group CodePink urged restraint and negotiation to avert escalating the Mideast crisis.
NIAC, which is circulating a petition demanding Congress act to avert U.S. intervention, is planning to hold a Tuesday afternoon No War With Iran Action Hour co-hosted with Peace Action and Action Corps.
"Trump continues to renege on his own commitments to diplomacy and an end to wars by perpetuating [Israeli Prime Minister Benjamin] Netanyahu's war of aggression through his own vocal support and U.S. military equipment and personnel in the region," NIAC said Tuesday. "Israel's assaults on Tehran have killed upwards of 224 Iranians and hospitalized over 1,277 more."
"Happening at the same time, in just the last day alone, Israeli forces have also killed at least 51 Palestinians desperate for aid and food at a World Food Program site in southern Gaza," NIAC noted. "There is no telling how much more devastation for Iran, Israel, and the U.S. an expanded war on Iran would bring."
"President Trump must immediately halt military aid and support for the Israel war on Iran," the group added, "and if he will not, Congress must act within its constitutional authority to save millions of American, Iranian, Israeli, and Palestinian lives."