Republicans on Wednesday blocked an emergency spending bill to fund the war in Ukraine, demanding strict new border restrictions in exchange and severely jeopardizing President Biden’s push to replenish the war chests of American allies before the end of the year.The failed vote highlighted waning support in the United States for continuing to fund Ukraine’s war effort at a perilous time in the conflict, with Kyiv’s counteroffensive failing to meet its objectives and Russia’s forces on the offensive. While the bill faltered over an unrelated immigration policy dispute, the resistance it has met in Congress reflects a dwindling appetite among Republicans for backing Ukraine, as polls show that Americans are losing interest in providing financial assistance.In the Senate, the vote to move forward on the bill was 49 to 51, short of the 60-vote threshold needed to advance.