Donald Trump’s election may have put a Balkan state’s admission to NATO on ice.

President Barack Obama has sent the Senate a proposed protocol to approve the accession of Montenegro to the alliance. But adopting the new protocol to the North Atlantic Treaty Organization requires the advice and consent of the Senate, and work on a resolution supporting ratification appears to have stalled.

A resolution has yet to be adopted by the Foreign Relations Committee.

That is cause for concern for Foreign Relations ranking Democrat Benjamin L. Cardin of Maryland, eager to see the Senate take up the measure before it adjourns next month.

“The accession of Montenegro of NATO should be noncontroversial, and we still have time to get it done in this lame duck session of Congress. It’s up to the Republican leadership to allow that to happen and I’ve made my views clear that the vote should take place as soon as possible,” Cardin said in a statement.