 Joe Biden is our nominee. He is not leaving this race. He is in this race, and I support him. In the Senate, the Majority Leader Chuck Schumer also backed the President, saying, quote, I'm for Joe. And as the questions swirl about the President's health, he faces a key test this week as he hosts leaders of NATO countries for a summit in D.C. It starts today. Bloomberg's News Director for Europe, Roz Matheson, says while many will have eyes on Biden, there is another key question overhanging the summit.