Platner, who became an oyster farmer and harbormaster after his four infantry tours in the US Army and Marine Corps, responded to Collins on social media, "As someone who works with many invertebrates, I know a spineless response when I see one..."
The progressive candidate also joined protesters in Portland on Saturday, addressing the crowd at Longfellow Square.
"This is not foreign policy. This is gangsterism on an international scale," Platner said to cheers. "We must not be fooled by the childish lies being used to justify this illegal aggression. Be wary of the establishment voices in media and in politics who, over the next few weeks, will work tirelessly to manufacture consent, even when they sound like they are opposed."
"Keep an ear out for 'this operation is bad, but' followed by words about democracy, dictatorship, and international law," he warned. "If those were justifications for invasion and abduction, we'd have invaded many of our allies a long time ago."
"Those voices are doing the work of empire, and we must be vigilant for their duplicitousness," he continued. "If they are media figures, change the channel. If they are political figures, work tirelessly to remove them from power."
President Donald Trump—who was elected with the backing of fossil fuel billionaires—addressed the nation after the attack on Saturday and again made clear that he has set his sights on Venezuelan oil.
In response to Trump, Platner called "bullshit," adding, "I watched my friends die in Iraq in the wake of speeches like this one." He also posted photos from the Portland protest and declared, "No blood for oil."
Platner also put out a video blasting the failure of federal lawmakers to pass a war powers resolution requiring congressional authorization for military action against the South American country.
In recent months, both GOP-controlled chambers of Congress have failed to pass resolutions that would have blocked Trump's strikes on alleged drug smuggling boats and war with Venezuela. In both Senate votes, Collins has voted no.
Platner highlighted the Republican senator's November vote against the Venezuela measure, which failed 49-51, and said that "from Iraq to Venezuela, you can count on Susan Collins to enable illegal foreign wars."
Meanwhile, Collins has affirmed her support for the US operation in Venezuela, saying in a Monday interview with News Center Maine that Maduro "should stand trial on American soil."
During Maduro's first court appearance in New York City on Monday, he said that "I am the president of Venezuela, and I consider myself a prisoner of war," and pleaded not guilty—as did his wife, Cilia Flores, who was also captured in Caracas.
Amid mounting global outrage and arguments that their abduction violated the US Constitution and international law, Senate Minority Leader Chuck Schumer (D-NY) has pledged to force another vote on a bipartisan war powers resolution this week.
Maine's other US senator, Angus King, an Independent who caucuses with Democrats, has voted for both previous war powers resolutions. After Trump abducted Maduro, King said that "I'm very concerned about where this leads."
"The Constitution lays out very clearly that Congress has the power to declare war," King added. "I know Congress has abdicated many of its powers in recent years, but I hope and plan on trying to return those fundamental duties back to the legislative branch as the founders designed."
Under reported pressure from Schumer, Maine Gov. Janet Mills is facing Platner in the Democratic primary contest for the Senate race. Although she has been friendlier to Collins than her progressive opponent, Mills has also called out the Republican senator over the Venezuela attack, saying that she "gave Donald Trump the green light to move us unilaterally towards a costly and unjustified war when she voted with her party against a bill to check his power."
"We have had enough of Sen. Collins feigning concern about the president's abuses on the one hand while she rubber-stamps his agenda and his actions on the other," Mills said. "I call on Susan Collins to use the power she claims to have as Maine's senior senator to demand accountability from the Trump administration and stand up to his dangerous and self-motivated power grab."
Polling published last month showed mixed results in the primary race, in the wake of Platner facing criticism for past social media posts and a tattoo he had covered up. His campaign told Axios on Monday that the candidate raised $4.7 million from more than 182,000 contributions in the final quarter of 2025, with an average donation of $25 per person.
"While the political elites in both parties have tried to write this movement off as a flash in the pan, we have shown time and time again that we not only have staying power but are building a ship that will last," Platner said in a statement.
