Talks on border security funding collapsed after Democratic and Republican lawmakers clashed over immigrant detention policy as they worked to avert another U.S. government shutdown, a Republican senator said on Sunday.

“The talks are stalled right now,” Republican Senator Richard Shelby told “Fox News Sunday.” He said the impasse was over Democrats’ desire to cap the number of beds in detention facilities for people who enter the country illegally.

Efforts to resolve the dispute over border security funding extended into the weekend as a special congressional negotiating panel aimed to reach a deal by Monday, lawmakers and aides said.

Democratic Senator Jon Tester played down any breakdown in talks. “It is a negotiation. Negotiations seldom go smooth all the way through,” he told the Fox program. Tester, one of 17 negotiators, said he was hopeful a deal could be reached.

But Shelby put the chances of reaching a deal by Monday at 50-50. No further talks were scheduled, a source told Reuters on condition of anonymity.

The lawmakers hoped to have an agreement by Monday to allow time for the legislation to pass the U.S. House of Representatives and Senate and get signed by President Donald Trump by Friday, when funding for the Department of Homeland Security and other federal agencies expires.

Trump agreed on Jan. 25 to end a 35-day partial U.S. government shutdown without getting the $5.7 billion he had demanded from Congress for a wall along the border with Mexico, handing a political victory to Democrats.

Instead, a three-week spending deal was reached with congressional leaders to give lawmakers time to resolve their disagreements about how to address security along the border.

One sticking point has been the Democrats’ demand for funding fewer detention beds for people arrested by U.S. Immigration and Customs Enforcement (ICE) agents. Republicans want to increase the number as part of their drive to speed immigrant deportations.

Since he ran for president in 2016, Trump has pledged to stop the influx of undocumented immigrants by building a wall on the border and crack down on immigrants living in the United States illegally by aggressively conducting more deportations. (NAN)