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 on Monday lashed out at Democrats after border security negotiations hit a snag in part because of their desire to cap the number of beds available to hold detained immigrants.

"The Democrats do not want us to detain, or send back, criminal aliens! This is a brand new demand. Crazy!" Trump tweeted.

The Democrats do not want us to detain, or send back, criminal aliens! This is a brand new demand. Crazy! — Donald J. Trump (@realDonaldTrump) February 11, 2019

Talks among lawmakers negotiating on funding for border security faltered over the weekend as the dispute about Immigration and Customs Enforcement's (ICE) ability to hold immigrants in detention centers emerged as the latest sticking point.

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"I think the talks are stalled right now," 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.) said Sunday. "I'm hoping we can get off the dime later today or in the morning because time is ticking away. But we got some problems with the Democrats dealing with ICE, that is detaining criminals that come into the U.S., and they want a cap on them, we don't want a cap on that."

Democrats want to cap the number of detention beds for immigrants picked up by ICE in other parts of the country away from the border at 16,000, an administration official said, down from 38,000. Republicans have pushed to exclude a number of immigrants convicted of a range of crimes from that cap.

Trump has sought to paint the Democratic position as dangerous, tweeting on Sunday that the party does not "even want to take muderers into custody!"

The standoff raises the specter of another partial shutdown or of Trump declaring a national emergency to secure wall funding. The latter move would likely prompt legal challenges.

Trump triggered a recent 35-day government shutdown with his demand for $5.7 billion for a wall along the U.S.-Mexico border. Democrats have offered $1.3 billion in funding for other border security measures, but no money for the wall.

The president agreed to reopen the government for a few weeks while a bipartisan group of lawmakers negotiates a deal to fund border security. Funding for a number of government agencies expires on Friday.