President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE is barreling toward a showdown with Congress over his decision to pull back U.S. troops in northern Syria despite widespread opposition.

The announcement, which caught leadership and traditional GOP allies flatfooted, sparked a wave of condemnation, with Republicans calling it a “disaster in the making,” a “catastrophic mistake” and a “terrible decision.”

Lawmakers are already weighing how to respond to Trump’s decision, setting the stage for a high-profile clash with Trump as soon as Congress returns from a two-week break on Monday.

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“Congress must and will act to limit the catastrophic impact of this decision,” said Rep. Liz Cheney Elizabeth (Liz) Lynn CheneyGOP lawmakers distance themselves from Trump comments on transfer of power Graham vows GOP will accept election results after Trump comments Liz Cheney promises peaceful transfer of power: 'Fundamental to the survival of our Republic' MORE (R-Wyo.), a member of House GOP leadership, adding that Trump’s decision was having “sickening and predictable consequences.”

Rep. Ro Khanna Rohit (Ro) KhannaOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package The movement to reform animal agriculture has reached a tipping point MORE (D-Calif.) warned that unless Turkey changes its behavior “everything is on the table,” including “suspending arms sales, to suspending economic aid to even considering their status in NATO.”

Lawmakers, scattered across the country for a two-week break, are having behind-the-scenes talks about potential legislative action and publicly throwing out a myriad of ideas ranging from a resolution opposing Trump’s actions to sanctions against Turkey to inserting language into a mammoth defense policy bill.

“Multiple committees are looking at possible legislative efforts to put the House on record against the President’s outrageous decision,” a House Democratic leadership aide told The Hill.

Senate Minority Leader Charles Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (D-N.Y) separately predicted that “Congress will take some form of action” given the “broad condemnation” sparked by Trump’s decision.

Lawmakers are under growing pressure to mount a formal response after Turkey began airstrikes and shelling against Kurdish forces in northern Syria and, hours later, moved ground troops into the country after Trump pulled back U.S. troops. Lawmakers have warned for days that Trump’s decision could endanger the Kurds, who were integral to the U.S.-led fight against ISIS.

Trump on Wednesday tried to distance himself from Turkey’s actions, saying the United States “does not endorse this attack and has made it clear to Turkey that this operation is a bad idea.” But he also said the United States should not be part of “endless, senseless wars.”

Trump reiterated that the U.S. stance is that it is now Turkey’s responsibility to ensure ISIS prisoners being held by the Syrian Democratic Forces do not escape and further claimed Ankara has committed to “protecting civilians” and “ ensuring no humanitarian crisis takes place.”

That’s done little to stem the flow of criticism from Capitol Hill.

“I said that President Trump's decision to abandon the Kurds ... was terribly unwise. Today, we are seeing the consequences of that terrible decision. If the reports of Turkish strikes in Syria are accurate, I fear our allies the Kurds could be slaughtered,” said Sen. Susan Collins Susan Margaret CollinsDemocratic senator to party: 'A little message discipline wouldn't kill us' Poll: 57 percent of Americans think next president, Senate should fill Ginsburg vacancy On The Trail: Making sense of this week's polling tsunami MORE (R-Maine).

Sen. Mitt Romney Willard (Mitt) Mitt RomneyCrenshaw looms large as Democrats look to flip Texas House seat The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election Trump dumbfounds GOP with latest unforced error MORE (R-Utah) lamented the “tragic loss of life among friends shamefully betrayed.”

One option under discussion would be to slap new sanctions on Turkey for invading Syria.

Sens. Lindsey Graham Lindsey Olin GrahamLincoln Project mocks Lindsey Graham's fundraising lag with Sarah McLachlan-themed video The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election Trump dumbfounds GOP with latest unforced error MORE (R-S.C.) and Chris Van Hollen Christopher (Chris) Van HollenCongress must finish work on popular conservation bill before time runs out Democrats fear Russia interference could spoil bid to retake Senate Mid-Atlantic states sue EPA over Chesapeake Bay pollution MORE (D-Md.) said after Turkey’s actions that they have reached an agreement on sanctions legislation. The bill would target Turkey’s energy sector and military. It also includes visa restrictions for Turkish leadership, including President Recep Tayyip Erdoğan, and would sanction any assets they have within U.S. jurisdiction.

“I am pleased to have reached a bipartisan agreement with Senator Van Hollen on severe sanctions against Turkey for their invasion of Syria. While the Administration refuses to act against Turkey, I expect strong bipartisan support,” Graham said.

“Most Members of Congress believe it would be wrong to abandon the Kurds who have been strong allies against ISIS,” he added.

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Van Hollen said the sanctions bill will be introduced next week and that they want a quick vote.

“Will ask for an immediate vote to send a clear message to Turkey that it must cease and desist its military action, withdraw its fighters from the areas under attack, and stop the tragic loss of life,” he said.

Sen. Marsha Blackburn Marsha BlackburnHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google Senate panel threatens subpoena for Google, Facebook and Twitter executives MORE (R-Tenn.), who has aligned herself closely with Trump, said on Wednesday that she will support new financial penalties.

“I condemn in the strongest possible terms any U.S. policy that will result in endangerment of the Kurds who have sacrificed so much blood and treasure alongside American forces. ... Turkey must pay the price for its aggression toward our Kurdish partners,” Blackburn said.

Trump downplayed the potential pushback, saying he thinks “it’s OK” if Congress imposes sanctions on Turkey even as he disagreed with Graham’s desire to stay in Syria and dismissed the Kurds because they “didn't help us in the Second World War.”

“I think Lindsey would like to stay there for the next 200 years and maybe add a couple a hundred of thousand people every place, but I disagree with Lindsey on that,” Trump told reporters at the White House. “But I will tell you that I do agree on sanctions, but I actually think much tougher than sanctions if [Erdogan] doesn’t do it in as humane a way as possible.”

Graham is also crafting a resolution formally opposing Trump’s decision, adding that he expects “it will receive strong bipartisan support.” A spokesman for Graham told The Hill this week that they were in the process of drafting the resolution.

It would mark the second time the Senate has rebuked Trump on Syria after providing veto-proof support for an amendment from Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellDemocratic senator to party: 'A little message discipline wouldn't kill us' House to vote on resolution affirming peaceful transition of power Republican lawyers brush off Trump's election comments MORE (R-Ky.) warning the president against withdrawing troops from Syria or Afghanistan earlier this year.

McConnell sent a warning shot on Monday saying that “the conditions that produced that bipartisan vote still exist today.”

Lawmakers could also slip language into a mammoth defense bill, known as the National Defense Authorization Act (NDAA). House and Senate lawmakers are negotiating on a final version of the legislation.

Senate Armed Services Committee Chairman Jim Inhofe James (Jim) Mountain InhofeOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds Democrats push to limit transfer of military-grade gear to police Chamber of Commerce endorses McSally for reelection MORE (R-Okla.) called Turkey’s actions “unacceptable” and warned that Ankara will face “serious economic, diplomatic and security consequences.”

“Erdoğan’s actions risk undermining our bilateral relationship, destabilizing northeastern Syria, squandering hard-won progress against ISIS, creating a new humanitarian crisis and harming our Kurdish partners,” Inhofe said.

A spokeswoman for Inhofe said because “the NDAA is currently in the conference process” she “couldn’t speculate” on whether it will include a response to the Syria situation.

A House Armed Services Committee spokeswoman told The Hill that lawmakers, led by House Foreign Affairs Committee Chairman Eliot Engel Eliot Lance EngelHouse panel halts contempt proceedings against Pompeo after documents turned over Engel subpoenas US global media chief Michael Pack 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-N.Y.), are working on legislation related to the issue separately from the NDAA, but could not immediately provide more detail. A House Foreign Affairs spokesman did not respond to a request for comment.

More than 50 House Democrats, led by Rep. Jason CrowJason CrowClark rolls out endorsements in assistant Speaker race Trump-Afghan deal passes key deadline, but peace elusive Cook shifts 20 House districts toward Democrats MORE (D-Colo.), sent a letter to Trump on Wednesday afternoon demanding he answer 10 questions about his Syria policy, including how the United States will ensure the Kurds’ protection and what Trump considers to be “off limits” for Turkey to do.

“This decision jeopardizes decades of trust in American solidarity and will only serve to undermine current and future alliances,” they wrote.

In the meantime, calls are mounting for the Trump administration to testify about the decision, providing a high-stakes setting where they would likely face a bipartisan grilling.

Romney and Sen. Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (D-Conn.) are urging Senate Foreign Relations Committee leadership to have administration officials testify before the panel and “explain to the American people how betraying an ally and ceding influence to terrorists and adversaries is not disastrous for our national security interests.”

Sen. Jack Reed John (Jack) Francis ReedOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds Democrats push to limit transfer of military-grade gear to police When 'Buy American' and common sense collide MORE (D-R.I.), the top Democrat on the Armed Services Committee, also called for Defense Secretary Mark Esper Mark EsperOvernight Defense: Stopgap spending measure awaits Senate vote | Trump nominates former Nunes aide for intelligence community watchdog | Trump extends ban on racial discrimination training to contractors, military Overnight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Official: Pentagon has started 'prudent planning' for full Afghanistan withdrawal by May MORE to testify before Congress “as soon as possible.”

“I would hope Secretary of State [Mike] Pompeo and Acting Director of National Intelligence [Joseph] Maguire will be called before the respective oversight committees as well,” Reed said.

“We need a full accounting and there is no time to waste. Congress must send a clear, bipartisan signal to this president that we do not condone his decision,” he added. “And it has to go beyond tweets and statements. We need action.”