How 41 Senators Could End the Iran War and Rein In Defense Spending

In the days after the September 11, 2001 attacks, I joined Harry Belafonte, Danny Glover, the Institute for Policy Studies, YES! Magazine, and hundreds of other signatories in calling for “Justice, Not Vengeance.” We argued that the United States should find and prosecute those responsible for 9-11 rather than launch wars against countries that had not attacked us.

We were right to worry: The wars that followed cost trillions of dollars and countless lives, and left the country less secure, not more.

Twenty-five years later, Congress faces a similar test—and a similar warning sign. The United States and Israel are at war with Iran, a war of choice that could prove even more disastrous than the decision to go to war with Afghanistan and Iraq.

While responsibility for the war lies with the Trump administration, Congress has a say in what happens next—if it chooses to act.

When the Senate reconvenes after their recess, they will face the question of approving the NDAA. Senators should use their leverage to change the disastrous direction of this administration’s defense policies.

Likewise, Congress can rein in historic levels of military spending and reject proposals to spend billions of dollars on a new generation of nuclear weapons, funded by taxpayers and historic levels of debt. And it can say no to the rapid development and deployment of AI weapons, an especially important step at a time when AI agents are already going rogue.

All it would take is 41 US senators. That is the number needed to stop the 2027 National Defense Authorization Act (NDAA)—a massive bill that sets defense policies and authorities, with a proposed price tag of $1.5 trillion.

The NDAA passed the US House of Representatives on July 22, but it has stalled in the US Senate.

Under Senate rules, 41 senators can filibuster to stop a bill from moving to the Senate floor for a vote, and the Democratic caucus has 47 senators. So, even in the minority, the Democratic senators—along with any Republicans who oppose “forever wars”—could prevent the NDAA from advancing without modifications.

When the Senate reconvenes after their recess, they will face the question of approving the NDAA. Senators should use their leverage to change the disastrous direction of this administration’s defense policies.

What specifically could 41 Senators do?

• Rein in the spending: Proposed defense spending is at the highest level in real dollars since World War II—a 38% increase over last year’s spending, funded by taxpayers and a national debt that has reached 124% the size of the entire US economy. This spending is unsustainable and unaccountable; the Pentagon just failed its eighth consecutive audit. Congress should restore the inspector general positions the Trump administration eliminated.
• End the war in Iran: Require a War Powers Act resolution, with appropriate guardrails to set the terms for an end to the war. Set limits on the use of taxpayer funds for the conflict.
• Reset our relationship with Israel. Cut military aid to Israel until it withdraws from Gaza, ends the spreading of Israeli settlements in the West Bank, and stops threatening its neighbors with unilateral military action. Strip Section 1217 from the Senate version of the NDAA, which would create a US-Israel Defense Technology Cooperation Initiative merging research, development, and deployment of military technologies with the Israeli military.
• Work for nuclear safeguards, not new weapons systems: End authorization for a new generation of nuclear weapons that includes the development of intermediate-range systems designed for use in regional conflicts. This risks turning nuclear weapons from a deterrent into a first-strike weapon of aggression. Require robust new arms-control talks aimed at reducing nuclear arsenals; none currently exist since the New START treaty expired on February 5, 2026, leaving the US and Russia with no binding limits on their strategic nuclear arsenals for the first time in decades.
• Stop illegal and ill-advised uses of the US military: Enforce the Posse Comitatus Act's prohibition on using US troops on American soil. End the extrajudicial killings of unidentified people on boats in the Caribbean and Pacific, now numbering 227. Prohibit using the military to threaten Canada, Greenland, and other allies as part of efforts to seize their territory.
• Put guardrails on AI-controlled weapons: This field is moving faster than Congress can track, and the NDAA is already the battleground. The House and Senate versions each include provisions on autonomous weapons and human oversight. But the same bill also directs the Pentagon to build a department-wide system for deploying agentic AI at speed and scale, pushing adoption forward even as the human-oversight rules meant to contain it remain unsettled. Congress should preserve and strengthen the human-oversight provisions, not let them get traded away in conference, and should require that no lethal-force decision—including nuclear launch decisions—is ever delegated to an algorithm. Three in four Americans agree: Decisions to kill should be made by people, not machines.

In January of this year, President Donald Trump called for raising the US spending on defense to $1.5 trillion, but has been uncharacteristically quiet about this eye-watering level of defense spending ever since.

Perhaps his silence is because he can see how deeply unpopular the US-Israel war against Iran has turned out to be. Sixty eight percent of Americans say it is not worth the costs, according to a July survey by the Chicago Council on Global Affairs, a level of unpopularity that parallels Americans’ views of the wars in Afghanistan and Iraq.

And there is no end in sight. In spite of President Trump’s bragging about an imminent US victory in Iran, The Wall Street Journal reports that Defense Secretary Pete Hegseth has extended Middle East deployments into 2027.

The US already spends more on the military than any other country—more than twice as much as China and five times as much as Russia. The enormous sums devoted to military spending, and the taxes and debt used to finance them, make the priorities of the American people more difficult to achieve.

Instead of ramping up dangerous conflicts and new weapons systems, we should fund an economy that meets the needs of our families, deploys solutions to the climate crisis, and makes healthcare and housing accessible to everyone. Instead of mounting debt, we should invest in prosperity for future generations.