A bipartisan pair of congressmen, including a vocal ally of President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE, on Tuesday unveiled a measure to prevent the president from conducting a military strike against Iran without congressional approval.

The National Defense Authorization Act (NDAA) amendment, offered by Reps. Ro Khanna Rohit (Ro) KhannaThe Hill Interview: Jerry Brown on climate disasters, COVID-19 and Biden's 'Rooseveltian moment' Congress needs to prioritize government digital service delivery DeJoy defends Postal Service changes at combative House hearing MORE (D-Calif.) and Matt Gaetz Matthew (Matt) GaetzTrump faces tricky choice on Supreme Court pick Florida attorney general scrutinizing Bloomberg paying fines for felons to vote Lara Trump campaigns with far-right activist candidate Laura Loomer in Florida MORE (R-Fla.), would prohibit funding for U.S. military action against Iran unless Congress has declared war or enacted another specific statutory authorization.

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“Last week, we watched President Trump come within minutes of striking Iran and involving the United States in yet another trillion-dollar war in the Middle East,” Khanna said in a statement. “President Trump campaigned on ending costly wars overseas but given the advisors he chose and his recent risky actions, he is not living up to that promise.”

Gaetz, who frequently backs the president, added that “Congress must resolve” to make sure any conflict with Iran is initiated within the constraints of the Constitution.

“This amendment affirms what President Trump knows and believes: unfocused, unconstitutional, unending wars in the Middle East make America weaker, not stronger,” Gaetz said in his own statement. “Iran must be prevented from obtaining a nuclear weapon and threatening international peace, but Congress must resolve to ensure that any military action is carried out constitutionally."

In an interview with Hill.TV on Monday, Trump said he does not think he needs congressional authorization to launch a military strike on Iran.

When asked if he believes he has the authority to initiate military action against Iran without first going to Congress, Trump said, "I do."

"But we’ve been keeping Congress abreast of what we’re doing ... and I think it’s something they appreciate," he said in an exclusive interview outside the Oval Office. "I do like keeping them abreast, but I don’t have to do it legally."

Trump’s comments Monday came after he called off a planned military strike against Iran last week in response to it shooting down a U.S. drone. Trump said he decided against it because the estimated death toll was not a proportional response, leaving open the possibility of a strike he would consider proportional.

On Tuesday, he said an Iranian attack on “anything” American would prompt “great and overwhelming force.”

“Any attack by Iran on anything American will be met with great and overwhelming force. In some areas, overwhelming will mean obliteration,” he tweeted.

Khanna offered a similar amendment during the House Armed Services Committee’s overnight markup of the NDAA earlier this month.

But after an hour of fierce debate, Khanna agreed to pull the amendment to clarify the language after securing a commitment to have it brought to the House floor for a vote.

“This bipartisan amendment is a vital safeguard against unilateral actions by this president who selected the architect of the Iraq war to be his national security advisor,” Khanna said Tuesday. “This amendment is also proof that opposition to war with Iran transcends partisan politics. With this effort, Americans can come together around the idea that we must stop a war with Iran.”

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Democrats in the Senate are also pushing for a vote on an amendment to that chamber’s version of the NDAA that would block funding for a military strike on Iran without congressional approval.

Senate Republicans, though, appear unlikely to give the amendment a vote, leaving Democrats to decide whether they will take the uncommon step to prevent Republicans from cutting off debate on the bill.