Democrats said Wednesday that the Trump administration failed to present evidence supporting the claim that a top Iranian general killed in a U.S. drone strike was planning an imminent attack.

The frustration boiled over after back-to-back closed-door briefings on the strike that killed Iranian Quds Force leader Gen. Qassem Soleimani.

Sen. Tim Kaine Timothy (Tim) Michael KaineThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep Catholic group launches .7M campaign against Biden targeting swing-state voters GOP senator to quarantine after coronavirus exposure MORE (D-Va.) said the evidence represented a “far cry” from an imminent attack, while Rep. Gerry Connolly Gerald (Gerry) Edward ConnollyHouse 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?' Hillicon Valley: Pentagon reaffirms decision to award JEDI contract to Microsoft | Schiff asks officials for briefing on election security threats MORE (D-Va.) called the briefing “sophomoric.”

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“I was utterly unpersuaded about any evidence about the imminence of a threat that was new or compelling,” Connolly said.

Sen. Robert Menendez Robert (Bob) MenendezKasie Hunt to host lead-in show for MSNBC's 'Morning Joe' Senators ask for removal of tariffs on EU food, wine, spirits: report VOA visa decision could hobble Venezuela coverage MORE (D-N.J.), the top Democrat on the Foreign Relations Committee, said the administration did not provide clarity on a potential attack and questioned why they were withholding information from Congress.

“I walk away unsatisfied in the key questions that I went into this briefing with, and it just makes me concerned that we cannot have clarity on those key questions — imminency, target, all of those things,” Menendez said.

Sen. Chris Van Hollen Christopher (Chris) Van HollenMid-Atlantic states sue EPA over Chesapeake Bay pollution Trump payroll-tax deferral for federal workers sparks backlash Senators urge administration to make payroll tax deferral optional for federal workers MORE (D-Md.) said the administration “did not establish in any way” that “an imminent threat was posed.” Asked whether she was convinced, 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.”

The comments came after 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 briefed House and Senate lawmakers separately on the strike that killed Soleimani.

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The strike brought the United States and Iran to the brink of war, with Tehran retaliating by launching missiles Tuesday at military bases in Iraq housing U.S. troops. Tension appeared to diffuse Wednesday after 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 confirmed no Americans were killed in Tuesday’s attack and said Iran appeared to be “standing down.”

Administration officials have said the Soleimani strike was necessary to pre-empt an “imminent” attack he was planning, but have offered little evidence publicly.

Sen. Chris Murphy Christopher (Chris) Scott MurphyGOP chairman to release interim report on Biden probe 'in about a week' This week: House returns for pre-election sprint Battle over timing complicates Democratic shutdown strategy MORE (D-Conn.), a member of the Foreign Relations panel, appeared skeptical that the administration had evidence that could prove it was responding to an immediate threat and characterized the fallout from the strike so far as “cataclysmic.”

“This appears to me to be a strike of choice by this administration, one that likely would have required congressional authorization beforehand,” Murphy said.

“There are serious political consequences to the decision that was made and we did not get information inside that briefing that there was a specific imminent threat that we were halting under the operation conducted last Thursday night think. ... I think it is likely that it doesn’t exist,” he added.

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Asked Tuesday about the nature of the threat, Pompeo discussed past activities, including the December rocket attack on an Iraqi military base that killed a U.S. contractor. Esper told reporters Tuesday the alleged attack was “days” away without elaborating on the nature of the threat.

Republicans have backed up the Trump administration’s assessment of Soleimani’s threat and walked away from Wednesday's briefing saying the evidence was clear.

Senate Foreign Relations Committee Chairman Jim Risch James (Jim) Elroy RischWhy the US should rely more on strategy, not sanctions Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump Senators blast Turkey's move to convert Hagia Sophia back into a mosque MORE (R-Okla.) said the evidence was “crystal clear,” adding that Democrats used the briefing to “question these people’s judgment on something that really shouldn’t have been questioned.”

“One of the things that came out of all of this is the tremendous hate and vitriol against this president, which is really coloring a lot of these people’s judgement on the defense of this country,” he added.

Sen. Roy Blunt Roy Dean BluntOn The Money: Trump undercuts GOP, calls for bigger COVID-19 relief package | Communities of color hit hardest financially by COVID-19 | Businesses, states pass on Trump payroll tax deferral Trump undercuts GOP, calls for bigger COVID-19 relief package Businesses, states pass on Trump payroll tax deferral MORE (R-Mo.) said the administration did not give many details at the briefing on the plot itself, but described a timing “that would have made it imminent.”

Rep. Mac Thornberry William (Mac) McClellan ThornberryTrump payroll-tax deferral for federal workers sparks backlash Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq Top Armed Services Republican 'dismayed' at Trump comments on military leaders MORE (R-Texas), the top Republican on the House Armed Services Committee, said he was “persuaded that we had strong intelligence that meant we had to take action.”

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.) said the briefing showed Soleimani was a “clear and present danger.”

Democrats agree Soleimani — who as the Quds Force leader was the architect of Iran’s proxy and shadow wars — was a dangerous man who was responsible for the deaths of hundreds of Americans through the years.

But they have questioned the wisdom and strategy behind the strike, saying previous administrations led by presidents from both parties judged the risks of killing Soleimani to be higher than the risk of leaving him alive.

“The basic theme of it was the administration was essentially saying trust us,” House Foreign Affairs Committee Chairman Eliot Engel Eliot Lance EngelThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep Coons beats back progressive Senate primary challenger in Delaware 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' MORE (D-N.Y.) said of Wednesday’s briefing. “We’re told it was an imminent threat. I’m not sure I’m convinced about that. Look, the person we took out is no sweetheart, and I’m no fan of his, and I’m no fan of the Iranian regime. The question is, do we want to get sucked into another war.”

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Engel added that he has several unanswered questions, noting he has invited Pompeo to appear at a public hearing next week. He raised the possibility of subpoenaing Pompeo if the secretary does not appear voluntarily, but said no decision has been made.

Breaking with some of his more critical Democratic colleagues, Rep. Adam Schiff Adam Bennett SchiffOvernight 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 Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies Intelligence chief says Congress will get some in-person election security briefings MORE (D-Calif.) characterized the briefing as a "useful" exchange. But he also quickly added that the hourlong meeting posed no substitute for the public hearings he hopes to stage into the reasoning behind the strike on Soleimani.

"There need to be open hearings where the administration answers questions about their strategy — or lack of strategy — [and] how this maximum pressure campaign, which is now made the likelihood of war with Iran so much greater, is somehow making Americans more safe," said Schiff, the chairman of the House Intelligence Committee. "I think the administration should be willing to answer those questions in a public forum.”

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.) said there are “many” questions left unanswered after the briefing, and wants the same set of officials to come back.

“As the questions began to get tough they walked out,” he said. “I’ve asked for a commitment that they all come back within a week.”

Mike Lillis contributed.