WASHINGTON — A bill that would reauthorize a crucial national security surveillance program was blocked Wednesday by a conservative revolt, pushing the prospects of final passage into uncertainty amid a looming deadline. The legislative impasse follows an edict earlier in the day from former President Donald Trump to “kill” the measure.

The breakdown comes months after a similar process to reform and reauthorize the surveillance program fell apart before it even reached the House floor. Speaker Mike Johnson, R-La., has called the program “critically important” but has struggled to find a path forward on the issue, which has been plagued by partisan bickering for years. The procedural vote to bring up the bill Wednesday failed 193-228, with nearly 20 Republicans voting no.

It marks the latest blow to Johnson’s leadership as he faces being ousted from his job in the same stunning fashion as his predecessor. Hours before the vote, the Republican leader made a final push urging for passage, saying Congress must “address these abuses” without cutting off the surveillance program entirely.

“It’s a critically important piece of our intelligence and law enforcement in this country,” he said in a press conference.

The bill in question would renew Section 702 of the Foreign Intelligence Surveillance Act, which permits the U.S. government to collect without a warrant the communications of non-Americans located outside the country to gather foreign intelligence. The reauthorization is currently tied to a series of reforms aimed at satisfying critics who complained of civil liberties violations against Americans.

But Republican opponents have complained that those changes did not go far enough. Among the detractors are some of Johnson’s harshest critics, members of the ultra-conservative House Freedom Caucus, who have railed the speaker for reaching across the aisle several times since taking the gavel in October to carry out the basic functions of the government.

It remains unclear now if the proposal, backed by the Biden administration and Johnson, would eventually have enough votes to advance.

“I’m just bewildered that a small number of members decided to take down the rule,” Rep. Jim Himes of Connecticut, the top Democrat on the House Intelligence Committee, told reporters on Wednesday evening.