 From ABC News, I'm Sherry Preston. The annual NATO summit is getting underway today in Washington, the alliance marking its 75th anniversary with a show of support for President Biden. National security spokesman John Kirby tells ABC's Good Morning America that Ukraine is high on the agenda for this week's NATO summit, as well as improving the deterrence and defense capabilities of the alliance. Asked about concerns among NATO officials about the president being up to the job and how he'll reassure them, Kirby said...