Senator Chuck Schumer, Democrat of New York and the majority leader, said on Thursday that he would set up a test vote next week on a measure pairing an immigration crackdown with tens of billions of dollars in military assistance to Ukraine and Israel, but the package is facing a rough road with Republican resistance in both chambers.

Mr. Schumer’s promise came as a small group of Republican and Democratic senators rushed to finalize a plan to clamp down on migration across the U.S. border with Mexico, which Republicans had demanded be paired with any further aid to Kyiv for its war against Russian aggression.

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