Kevin Kiley

A bipartisan effort to force a vote on legislation sending fresh American security aid to Ukraine has amassed the 218 signatures needed to force a floor vote, the latest in a series of instances of rank-and-file lawmakers wresting control of the chamber’s agenda from Republican leaders.

The legislation, introduced by Representative Gregory W. Meeks of New York, the top Democrat on the Foreign Affairs Committee, had languished for months as its backers remained just one signature short of the support they would need to steer around the leadership and secure quick action.

But on Wednesday, Representative Kevin Kiley, the California independent who caucuses with Republicans, signed onto the effort, known as a discharge petition, which calls for a vote and starts a clock that will compel House leaders to bring the measure to the floor as soon as the end of the month.

The measure has little chance of enactment given widespread Republican opposition, including by President Trump. But the success of the discharge petition was another blow to Speaker Mike Johnson, who has struggled to keep control of his conference and the House floor given his razor-thin majority.

The bill would authorize $1.3 billion in security assistance for Kyiv and up to $8 billion more in additional support via direct loans. It would also seek to replenish U.S. weapons stocks, establish financing mechanisms for postwar reconstruction, and impose new sanctions targeting Russia and the entities supporting its war effort.

The petition has been signed by all Democrats, along with two Republican representatives, Don Bacon of Nebraska and Brian Fitzpatrick of Pennsylvania. Given the G.O.P.’s slim vote margin, those signatures along with Mr. Kiley’s were enough to bring the petition to the threshold needed to force a vote on the bill.

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