Democrats are set for a clash with President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE over war powers and Iran.

House Democrats will vote Thursday on a war powers resolution that would rein in Trump’s ability to take military action against Iran without congressional signoff, a culmination of days of frustration on Capitol Hill with the administration’s strategy.

The vote comes as both Trump and Iranian officials signaled that they were trying to ratchet down tensions inflamed with the U.S. airstrike that killed Iranian Gen. Qassem Soleimani. Iran responded with a missile attack Tuesday on two Iraqi bases that house U.S. troops.

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Democrats emerged from back-to-back closed-door briefings on Iran voicing deep frustration about what Trump’s plan is moving forward.

A quartet of top administration officials — Defense Secretary Mark Esper Mark EsperTop admiral: 'No condition' where US should conduct nuclear test 'at this time' Overnight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Oldest living US World War II veteran turns 111 MORE, Secretary of State Mike Pompeo Michael (Mike) Richard PompeoHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers Treasury Dept. sanctions Iranian government-backed hackers The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE, CIA Director Gina Haspel Gina Cheri HaspelRussian bounties revive Trump-GOP foreign policy divide Overnight Defense: House panel votes to ban Confederate flag on all Pentagon property | DOD report says Russia working to speed US withdrawal from Afghanistan | 'Gang of Eight' to get briefing on bounties Thursday Top intelligence officials to brief Gang of Eight on Thursday MORE and Joint Chiefs of Staff Chairman Gen. Mark Milley — were dispatched to brief both the House and Senate on Wednesday amid days of concerns from lawmakers that Trump was on a path to war with Iran.

“Members of Congress have serious, urgent concerns about the administration’s decision to engage in hostilities against Iran and about its lack of strategy moving forward. Our concerns were not addressed by the president’s insufficient War Powers Act notification and by the administration’s briefing today,” House Speaker Nancy Pelosi Nancy PelosiMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Pelosi must go — the House is in dire need of new leadership MORE (D-Calif.) said in announcing the vote.

The House resolution would force Trump to end hostilities against Iran unless Congress authorizes a war or the action is to thwart an imminent threat. The administration has justified the strike that killed Soleimani by saying it was needed to prevent an “imminent” threat.

Democrats were widely unsatisfied by the intelligence provided during the briefing, which Rep. Gerry Connolly Gerald (Gerry) Edward ConnollyJudge issues nationwide injunction against Postal Service changes House panel advances bill to ban Postal Service leaders from holding political positions Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' MORE (D-Va.) called “sophomoric and utterly unconvincing.”

“I believe there was no rationale that could pass a graduate school thesis test,” he said. “I was utterly unpersuaded about any evidence about the imminence of a threat that was new or compelling.”

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Asked about whether she was convinced of an imminent threat, presidential candidate Sen. Elizabeth Warren Elizabeth WarrenWarren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon No new taxes for the ultra rich — fix bad tax policy instead MORE (D-Mass.) said flatly “no,” without elaborating.

“I have already said I don’t think the U.S. is any safer after killing Soleimani. In fact, I think the U.S. is much closer to war. Donald Trump has put this country at risk. This was a Trump-made crisis,” Warren told reporters on Capitol Hill.

Thursday’s vote is unlikely to be the last clash on the issue.

Senate Minority Leader Charles Schumer Chuck SchumerMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security Warren, Schumer introduce plan for next president to cancel ,000 in student debt Schumer lashes out at Trump over 'blue states' remark: 'What a disgrace' MORE (D-N.Y.) has asked for a second Iran briefing with the same administration officials within a week. He noted that only 15 senators were able to ask questions Wednesday.

“As the questions began to get tough, they walked out,” he said.

Pelosi said the House is considering additional legislation, including a repeal of the 2002 Authorization for the Use of Military Force (AUMF) and legislation to block the administration from using funding to carry out military activities against Iran. The 2002 AUMF authorized the Iraq War and has been cited by the administration as part of its legal justification for the Soleimani strike.

A Senate war powers vote is expected as soon as next week, on a resolution from Sen. Tim Kaine Timothy (Tim) Michael KaineBiden promises Democratic senators help in battleground states Second GOP senator to quarantine after exposure to coronavirus The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (D-Va.) that would make Trump withdraw U.S. troops from hostilities against Iran within 30 days unless there was an “imminent” threat.

Kaine said Wednesday that he is continuing to gather support for his measure, saying he is talking to colleagues about any “adjustments” they would like to see.

In a blow to the administration, Sens. Mike Lee Michael (Mike) Shumway LeeMcConnell shores up GOP support for coronavirus package McConnell tries to unify GOP Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (R-Utah) and Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.) both announced after the Senate’s closed-door briefing that they will support Kaine’s proposal.

To pass the Senate, and spark a veto showdown with Trump, Democrats need four Republicans to get the 51 votes to initially pass the war powers resolution.

Lee, Paul and Sens. Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally Gideon leads Collins by 12 points in Maine Senate race: poll Senate leaders quash talk of rank-and-file COVID-19 deal MORE (R-Maine) and Jerry Moran Gerald (Jerry) MoranLobbying world This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans Hillicon Valley: Zuckerberg acknowledges failure to take down Kenosha military group despite warnings | Election officials push back against concerns over mail-in voting, drop boxes MORE (R-Kan.) previously supported a similar resolution from Kaine and Sen. Tom Udall Thomas (Tom) Stewart UdallLWCF modernization: Restoring the promise OVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency MORE (D-N.M.). Before the briefing, Lee’s spokesman had said he would oppose Kaine’s new measure and Paul had been undecided.

Lee characterized the meeting with the administration as “the worst briefing I’ve seen, at least on a military issue,” and said officials warned that Congress would “embolden” Iran if lawmakers debated Trump’s war powers.

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“I find this insulting and demeaning ... to the office that each of the 100 senators in this building happens to hold. I find it insulting and demeaning to the Constitution of the United States,” Lee said, adding that the administration’s logic was “insane.”

Lee said he was undecided on Kaine’s proposal before the briefing but that he was now prepared to support it “specifically because of what happened in that briefing.”

Paul added that he would also back Kaine’s measure, questioning the administration’s decision to use the 2002 AUMF.

“I see no way in the world you could logically argue that an authorization to have war with Saddam Hussein has anything to with having war with people currently in Iraq,” Paul told reporters, adding that using the 2002 AUMF to cover the Soleimani strike was “absurd” and an “insult.”

The new momentum for Democrats came even as Trump, and many of his GOP allies, claimed victory after both Washington and Tehran tried to ramp down tensions.

Trump, speaking from the White House on Wednesday morning, appeared to take a victory lap, characterizing Iran as “standing down” and noting that no Americans were killed by the missile attack against Iraqi bases that house U.S. personnel.

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He was quickly backed up by Republicans on Capitol Hill — some of whom had publicly warned against Trump escalating tensions — as they declared that Trump’s strike against Soleimani successfully deterred Iran from more provocative attacks.

“Based on the president’s speech today and certainly based on the intelligence … I would say that I’m optimistic that we can look at a de-escalating environment,” Rep. Mark Meadows Mark Randall MeadowsTrump won't attend UN General Assembly in person, Meadows says McConnell focuses on confirming judicial nominees with COVID-19 talks stalled Overnight Health Care: Ex-Pence aide backs Biden over virus response | Trump's sharp words put CDC director on hot seat | Trump coronavirus adviser threatens to sue Stanford researchers MORE (R-N.C.), a top ally of President Trump’s, told reporters. “It’s a good day for America.”

Asked if Trump was trying to de-escalate, Senate Armed Services Committee Chairman James Inhofe James (Jim) Mountain InhofeOvernight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Top admiral: 'No condition' where US should conduct nuclear test 'at this time' When 'Buy American' and common sense collide MORE (R-Okla.) said “he’s done it with the cooperation” of the Iranians, pointing to Foreign Minister Mohammad Javad Zarif.

“Both of them are saying they want to negotiate,” Inhofe said. “The door is open.”