President Joe Biden on Wednesday called on Congress to urgently approve a stalled package of aid to Ukraine, hours before a planned key Senate procedural vote that Republicans are vowing to block as they demand changes to U.

U.S. President Joe Biden implored Congress on Wednesday to approve more arms aid to Ukraine, saying that failing to pass the assistance would be the “greatest gift” the United States could hand Russian President Vladimir Putin in Putin’s nearly two-year war against the neighboring country.