text:  The president says he's staying in the race and insists he can beat Trump. Deirdre Walsh, NPR News. NATO's gearing up to mark its 75th birthday with a summit in Washington this week. But as Terry Schultz reports, the atmosphere is one more of concern than celebration. More than two years into a war at NATO's borders, Secretary General Jens Stoltenberg says solidifying support for Ukraine is the Washington summit's most urgent task.