DAVID MUIR: There is also breaking news here in the U.S. Ukraine's President Zelenskyy just moments ago, before the cameras in Washington with President Biden, with his urgent plea for help from the U.S. in trying to fight off Russia. But that funding is being blocked by Republicans and their demands tonight. President Biden promising the American people will not walk away from Ukraine, but the reality is, that funding is being blocked. Republican leaders listening to Zelenskyy's pleas during meetings on the Hill today, but not moved to act. The president tonight saying those who stand in the way of this urgent help are giving Putin the greatest Christmas gift they can possibly give him. Zelenskyy late today saying, “we are fighting for us and for you”, trying to remind anyone listening of the stakes up against Russia. The Republicans blocking this are saying, “no more money until the White House does what we want on the border”. President Biden arguing help for Ukraine should not be held hostage.