The prospects for passing legislation to speed military aid to Ukraine this year are fading, as Republicans balk at striking a quick deal on immigration policy changes they have demanded in exchange for allowing the bill to move forward.

A weekend of intensive bipartisan talks to strike a compromise on how to clamp down on migrants at the U.S. border with Mexico yielded progress, according to lawmakers in both parties, but no breakthrough. And with President Biden and Senate Democrats pressing hard to revive the Ukraine aid bill before leaving for the holidays, Republicans let it be known they had no intention of dropping their objections by then.

“We feel like we’re being jammed,” Senator Lindsey Graham, Republican of South Carolina, said on NBC’s “Meet the Press” on Sunday. “We’re not anywhere close to a deal. It’ll go into next year.”

Senate negotiators, who since last week have been meeting daily with White House officials and Alejandro Mayorkas, the homeland security secretary, to hash out a way forward, said they had resolved some disputes over enhanced border enforcement measures.