President Biden’s supplemental spending request aid for Ukraine, Israel and Taiwan continues to be stall over how to address the U.S.-Mexico border migration crisis.

Senate Minority Leader Mitch McConnell (R-Ky.) acknowledged Wednesday in a closed-door Senate Republican meeting that a border deal in discussions seems unlikely to pass, according to The Hill and other outlets.

McConnell told his colleagues they were in a “quandary,” CNN’s Manu Raju reported. McConnell reportedly referred to former President Donald Trump as the party’s “nominee” and said the Senate should defer to him; Trump has said he’s against a bipartisan immigration deal.

For months, the immigration language has been seen as key to getting enough Republican support for the Ukraine aid package, which is once again in the air.

“When we started this, the border united us and Ukraine divided us,” McConnell said at the Wednesday meeting, Punchbowl News’ Jake Sherman and John Bresnahan reported. “The politics on this have changed.”

The Hill photo by Greg Nash