Key negotiators seeking to avoid a new partial government shutdown are poised to meet at 3:30 p.m. Monday after talks derailed over the weekend.

A Senate aide confirmed that Sens. 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.) and Patrick Leahy Patrick Joseph LeahyBattle over timing complicates Democratic shutdown strategy Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (D-Vt.) and Reps. Nita Lowey Nita Sue LoweyTop House Democrats call for watchdog probe into Pompeo's Jerusalem speech With Biden, advocates sense momentum for lifting abortion funding ban Progressives look to flex their muscle in next Congress after primary wins MORE (D-N.Y.) and Kay Granger Norvell (Kay) Kay GrangerGOP women's group rolls out six-figure campaign for Ernst Bottom line Helping our seniors before it's too late MORE (R-Texas) will meet on Monday afternoon to try to break the stalemate.

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The meeting comes days ahead of Congress's Feb. 15 deadline to clinch a deal on President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's U.S.-Mexico border wall and funding for roughly a quarter of the federal government, including the Department of Homeland Security.

If they can't get a larger agreement by then, Congress would need to pass a continuing resolution to punt the border fight and prevent a second lapse in funding in as many months.

Lawmakers left Washington late last week relatively optimistic they would be able to get a deal by Friday, the date established by a three-week stopgap measure that Trump signed into law last month, ending the longest shutdown in U.S. history.

But talks remain stuck on two key issues: the amount of physical barrier funding and the number of Immigration and Customs Enforcement (ICE) detention beds to be funded.

Shelby, speaking Sunday, acknowledged that talks were stalemated and put the chances of getting a deal at 50-50.

“We're hoping we can get there. But we've got to get fluid again. We've got to start movement,” Shelby said on “Fox News Sunday.”

Without specifically mentioning Democrats, Shelby released a letter on Monday from sheriffs groups warning against capping the number of ICE detention beds.

Democrats acknowledged on Sunday that they had proposed a cap on the number of ICE detention beds, arguing it would force the Trump administration to focus on “serious criminals” and was in line with numbers from the Obama administration.

“The Trump Admin has been tearing communities apart with its cruel immigration policies. A cap on ICE detention beds will force the Trump Admin to prioritize deportation for criminals and people posing real security threats, not law-abiding immigrants contributing to our country,” Rep. Lucille Roybal-Allard Lucille Roybal-AllardHispanic Caucus asks for Department of Labor meeting on COVID in meatpacking plants Democrats may bring DHS bill to House floor Texas Democrat proposes legislation requiring masks in federal facilities MORE (D-Calif.) said in a tweet.