 Asked about security threats at the upcoming political conventions in Milwaukee and Chicago, Secret Service Director Kimberly Chittle, head of security. There's nothing specific and nothing credible out there right now, but we are tracking all threat streams, and we certainly work with our partners at the FBI and other intelligence agencies that supply that information to us. New steps to strengthen Ukraine's air defenses and military capabilities will be announced at the NATO summit coming up this week in Washington. This is a senior Biden administration official. Summit starts on Tuesday.