The Ukrainian president delivered an urgent plea for more help for his country in its fight against Russia, only to be told by Republicans that his challenges were not their focus.
The minority leader, who many believe could step down next year, has found himself out of step with many fellow Senate Republicans on the question of keeping money flowing to the U.S. ally.
President Biden and Democrats in Congress appealed for Republicans to allow the emergency spending bill to advance, but the G.O.P. dug in, demanding strict border provisions be added.
Republicans and Democrats, including President Biden, appear to agree that any war spending package must include immigration changes, but the parties are divided over how far such a deal should go.