Congress struggled Tuesday to finalize a 2018 spending package, leaving negotiators scrambling for an eleventh-hour breakthrough and top leaders weighing the need for a short-term spending patch to prevent yet another government shutdown on Saturday.

House GOP leaders had hoped to pass a massive $1.3 trillion omnibus spending bill on Wednesday, which would have given the Senate several days to move the package through the upper chamber, where a single lawmaker can delay the consideration of bills.

But entrenched partisan differences over a number of policy riders — accompanied by a freak March storm that threatened to dump heavy snow on Washington and shutter Congress on Wednesday — thwarted those plans.

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With time running out until a shutdown, leaders of both parties on Tuesday floated passing what would be the sixth stopgap measure of the fiscal year.

“That would be the one thing we could do,” said Sen. John Cornyn John CornynCalls grow for Biden to expand election map in final sprint Bipartisan praise pours in after Ginsburg's death Chamber of Commerce endorses McSally for reelection MORE (Texas), the second-ranking Republican in the upper chamber, referring to the possibility of another continuing resolution (CR).

As of press time Tuesday evening, no agreement on the spending package had yet emerged. And while the top leaders of each party were optimistic a deal could be struck before the day’s end, the mood among rank-and-file members was grim.

“It’s just a mess,” one GOP lawmaker told The Hill after Tuesday’s last series of votes.

Rep. Charlie Dent Charles (Charlie) Wieder DentRepublican former Michigan governor says he's voting for Biden Biden picks up endorsements from nearly 100 Republicans Bush endorsing Biden? Don't hold your breath MORE (R-Pa.), who chairs an Appropriations subcommittee, said he’s “uneasy” about the evolving legislation — a reference to both its substance and its prospects on the floor. The drawn-out negotiations, Dent suggested, reflected concerns like his.

“Although I’d like to see this thing closed out Wednesday night, I wouldn’t bet the ranch on it,” Dent told The Hill Tuesday afternoon.

The delay, while a headache for GOP leaders in both chambers, is less of a problem in the House, where bills can be passed quickly. The worry is the Senate, where any lawmaker can use the chamber’s procedural rules to block votes, if only temporarily.

Last month, Sen. 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.) single-handedly prevented leaders of his own party from expediting consideration of a similar budget deal to protest the enormous deficit spending contained in the agreement. Paul’s delay tactic caused a brief government shutdown.

Paul on Tuesday hinted that he might repeat the protest.

“We haven’t decided,” Paul said.

House Minority Leader Nancy Pelosi Nancy PelosiAs families deal with coronavirus, new federal dollars should follow the student Sunday shows - Ruth Bader Ginsburg's death dominates Hypocrisy rules on both sides over replacing Justice Ginsburg MORE (D-Calif.), who last week had all but dismissed the notion of passing another CR, is conceding a stopgap might be necessary.

“Somebody said that the Senate might not be able to get their work done and there might be a CR just to get through the time,” Pelosi said.

“But we have to pass our bill first.”

The weather is not the only factor squeezing Congress’s schedule. There’s also the funeral for the late Rep. Louise Slaughter Dorothy (Louise) Louise SlaughterDemocrats must go on the offensive against voter suppression House passes bill to explicitly ban insider trading Sotomayor, Angela Davis formally inducted into National Women's Hall of Fame MORE (D-N.Y.), who died last week at age 88 and will be interred in Rochester, N.Y., on Friday.

Slaughter was a beloved figure on Capitol Hill, and many lawmakers from both parties are expected to attend her funeral service.

Even a one-day delay for the omnibus could carry political implications. It could put Senate lawmakers — particularly opponents of gun reform — in the uncomfortable position of being on Capitol Hill amid an enormous march for gun control that is scheduled for Saturday on the National Mall.

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellOcasio-Cortez to voters: Tell McConnell 'he is playing with fire' with Ginsburg's seat McConnell locks down key GOP votes in Supreme Court fight Video shows NYC subway station renamed after Ruth Bader Ginsburg MORE (R-Ky.) said his focus is on passing the omnibus, not worrying about gun protests.

“We’re going to do it this week, and as long as that takes, that’s the time we’ll put in,” he said.

A few stubborn disagreements persisted into Tuesday evening. One of them revolved around the Republicans’ push for funding for the border wall and heightened enforcement of immigration laws — priorities of President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE’s but a non-starter with the Democrats.

A second major sticking point involved the Gateway project, a commuter rail tunnel connecting New York and New Jersey beneath the Hudson River. The project is a priority of regional lawmakers, but Trump has threatened to veto the omnibus if the roughly $900 million in Gateway funding is attached.

Sen. Richard Shelby Richard Craig ShelbySenate GOP eyes early exit Dems discussing government funding bill into February GOP short of votes on Trump's controversial Fed pick MORE (R-Ala.), who’s soon to take the gavel of the Senate Appropriations Committee, declined to specify the holdups. But in an impromptu game of charades, he revealed what they are.

First Shelby stretched his arms out wide, leading reporters to guess he was referencing the border wall. Then he made a dipping motion with his arm, and reporters guessed “tunnel.”

“Y’all draw inferences pretty well,” Shelby said.

Jordain Carney, Scott Wong and Melanie Zanona contributed.