 to tell Biden their advice on whether he should stay in the race or not. Michael O'Hanlon is senior fellow and director of research in foreign policy at the Brookings Institution. He joined us earlier on WTOP. And President Biden is promising new measures to boost Ukraine's air defenses. This after a barrage of Russian missiles against Kiev and other cities killed 36 people. President Biden says the United States and its allies would announce this new assistance at a NATO summit, of course, that we've been discussing this week here in D.C.