In a striking turn of events, Senate Republicans threatened Monday to block a major bipartisan package of border security measures and asylum restrictions, just one day after their chief negotiator signed off on it.

GOP senators left a special closed-door meeting in the evening predicting that their party would not provide enough votes to move forward with the package Wednesday, saying they agreed they need more time to discuss changes to the bill in the form of amendments.

“I would anticipate Wednesday the cloture vote does not pass,” Sen. James Lankford, R-Okla., the lead GOP negotiator in the border talks, told reporters after the meeting. “People are saying, ‘Hey, I need a lot more time to be able to go through this.’”

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