text:  there. And every performance after that. Barbara, thanks so much. Thank you. That's NPR congressional reporter Barbara Sprunt. NATO allies are gathering for a summit in Washington on the 75th anniversary of the alliance's founding in the city where it all began. The alliance faces some of its biggest challenges as it looks ahead to political uncertainty in a number of countries, including the United States. Terry Schultz has covered NATO for many years and joins me now. Hi, Terry.