House GOP leaders’ strategy to avert a government shutdown was thrown into uncertainty Tuesday amid growing demands from conservative hard-liners and defense hawks.

While no final decisions had been made as of late Tuesday, one option gaining traction would be for lawmakers to pass a two-week continuing resolution (CR) to keep the government funded through Dec. 22.

Under that scenario, the House then would pass a longer-term defense spending bill before the end of the year. The measure would move in tandem with another short-term patch to fund the government through late January.

But leaders of the conservative House Freedom Caucus, who threatened to derail a procedural tax vote on Monday night to gain more leverage in the spending talks, have been pushing for an initial CR that lasts through Dec. 30, warning that lawmakers would face far greater pressure to accept a bad spending deal right before Christmas.

“We’ve had a great conversation. No deal yet,” House Freedom Caucus Chairman Mark Meadows Mark Randall MeadowsHouse moves toward spending vote after bipartisan talks House Democrats mull delay on spending bill vote Southwest Airlines, unions call for six-month extension of government aid MORE (R-N.C.) said as he and his conservative ally, Rep. Jim Jordan James (Jim) Daniel JordanSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election House passes resolution condemning anti-Asian discrimination relating to coronavirus Republicans call for Judiciary hearing into unrest in cities run by Democrats MORE (R-Ohio), emerged from a meeting in the Speaker’s office.

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The Freedom Caucus will meet Wednesday morning to determine how to respond to the various options. Conservatives said the annual White House holiday party for lawmakers and their spouses prevented them from meeting Tuesday evening.

Meadows and his predecessor as Freedom Caucus chairman, Jordan, were among the key negotiators who huddled with Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) in his second-floor suite on Tuesday afternoon to hash out a last-minute deal to avert a shutdown.

They were joined at the meeting by two leaders of the conservative Republican Study Committee, Chairman Mark Walker Bradley (Mark) Mark WalkerMike Johnson to run for vice chairman of House GOP conference The Hill's Morning Report - Sponsored by National Industries for the Blind - Woodward book revelations rock Washington The Hill's 12:30 Report — Presented by Facebook — Trump, Biden duel in final stretch | Vaccine trial on pause after recipient's 'potentially unexplained illness' | Biden visits Michigan | Trump campaign has 18 events in 11 states planned in the next week MORE (N.C.) and Rep. Jeb Hensarling Thomas (Jeb) Jeb HensarlingLawmakers battle over future of Ex-Im Bank House passes Ex-Im Bank reboot bill opposed by White House, McConnell Has Congress lost the ability or the will to pass a unanimous bipartisan small business bill? MORE (Texas), and a pair of top defense hawks, Armed Services Chairman 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) and Rep. Liz Cheney Elizabeth (Liz) Lynn CheneyOVERNIGHT ENERGY: Cheney asks DOJ to probe environmental groups | Kudlow: 'No sector worse hurt than energy' during pandemic | Trump pledges 'no politics' in Pebble Mine review Cheney asks DOJ to probe environmental groups Press: The big no-show at the RNC MORE (R-Wyo.).

Leadership had been prepared to forge ahead with a clean Dec. 22 CR, but then abruptly delayed a House Rules Committee vote on the two-week funding bill that was planned for Tuesday. The Rules vote, now set for Wednesday, means the House may not bring the stopgap funding bill to the floor until Thursday, just one day before current funding expires.

Rank-and-file Republicans say they have no appetite for a shutdown, and Ryan and Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Senate GOP aims to confirm Trump court pick by Oct. 29: report Trump argues full Supreme Court needed to settle potential election disputes MORE (R-Ky.) have already vowed that the government’s lights will stay on past Friday’s deadline.

Republicans have in the past had to rely on House Minority Leader Nancy Pelosi Nancy PelosiPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House lawmakers reach deal to avert shutdown Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill MORE (D-Calif.) and the Democrats to pass stopgap funding bills. But House Republicans said Tuesday they believe they can muster the 218 votes needed to send a CR to the Senate on their own.

GOP leaders on Tuesday made the case to rank-and-file lawmakers that extending funding to Dec. 22 would give Republicans a window to pass a tax bill, then turn their focus back to spending issues.

“It takes the focus off everything else and puts it on tax reform,” said Rep. Dennis Ross Dennis Alan RossRep. Ross Spano loses Florida GOP primary amid campaign finance scrutiny Israelis and Palestinians must realize that each needs to give, not just take Court opens door to annexing the West Bank — and the consequences could be disastrous MORE (Fla.), a senior member of the GOP whip team.

Demands from defense hawks also are gumming up CR talks. Emerging from Ryan’s office on Tuesday, Thornberry reiterated they’re reluctant to back a stopgap bill unless spending caps are lifted and funding is boosted for the Pentagon through the rest of the 2018 fiscal year.

“A CR hurts the military, does damage to the military every single day,” Thornberry told reporters, “and with accidents increasing, North Korea lobbing missiles toward us, we cannot afford to continue to inflict that sort of damage to our military.

“Defense is too important to use as a political football,” he said.

Rep. Richard Hudson Richard Lane HudsonHow Congress is preventing a Medicare bankruptcy during COVID-19 Cook shifts 20 House districts toward Democrats American meat producers must leverage new technology to protect consumers, workers MORE (R-N.C.), who represents Fort Bragg, said he had lunch with Ryan and other lawmakers on Tuesday to express his concerns with how a temporary funding patch would hurt the military community.

“Most of us who understand national security know how harmful CRs are to the military,” Hudson told The Hill.

It’s unclear whether Democrats would be willing to go along with the emerging GOP plan. Their support would be crucial in the Senate, where at least eight Democratic votes would be needed to overcome a filibuster.

Democrats have traditionally insisted that any increase in defense spending above budget caps be paired with an increase in spending on domestic programs.

“We have to have domestic priorities also,” said Sen. Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE (D-Mo.).

But “I’m not going to draw a line in the sand until I see what it looks like,” she added.

Many Democrats and some moderate Republicans have also been demanding that any spending legislation that stretches into 2018 include a fix for former President Obama’s Deferred Action for Childhood Arrivals (DACA) program, which grants work permits to certain young immigrants who came to the U.S. illegally as children.

But Senate Minority Leader Charles Schumer Chuck SchumerSenate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' Jacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee MORE (D-N.Y.), who will sit down with Pelosi, Ryan, McConnell and Trump at the White House on Thursday to discuss a funding deal, batted down suggestions on Tuesday that a fight over the Obama-era immigration program will spark a government shutdown.

“We don’t think we’re going to get to that. There are good negotiations occurring between Democrats and Republicans to come up with a good DACA program, as well as some good border security,” Schumer said when asked if Democrats will support the year-end spending bill.

He added that Democrats “think we’re moving in the right direction there.”

Another complication on a funding bill is the commitment that McConnell gave to Sen. Susan Collins Susan Margaret CollinsSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-Maine) to help win her vote for the tax-reform bill. McConnell pledged to support passage of two bipartisan ObamaCare fixes before the end of the year, which could be attached to a funding bill.

But House conservatives say they oppose the measures and see them as simply propping up ObamaCare, raising questions about whether the measures can pass the House.

In addition, Ryan’s office told a meeting of staff from the top four congressional leadership offices on Monday that the Speaker was not part of the deal between McConnell and Collins, and does not have the same commitment to pass the ObamaCare bills, according to a source familiar with the meeting.

Ryan told reporters Tuesday he was having “continued discussions with our members” about the health-care issue.

Collins told reporters Tuesday when asked about objections from House conservatives that she would have to have “absolute assurance” about the ObamaCare bills passing if the vote on the final tax bill comes before that.

“I still believe that the commitment that was given to me will be kept and I have no reason to believe that it won’t be,” she said.

Peter Sullivan and Jordain Carney contributed.