 Live from NPR News in Boston, I'm Steve Brown. NATO leaders are gathering in Washington this week as the military alliance confronts the prospect of the return of NATO skeptic Donald Trump to the White House. The summit kicks off today and heads of state will work to shore up transatlantic support for Ukraine and its battle against Russia. But for summit host President Joe Biden, it's just as much about demonstrating he's capable of meeting the grinding demands of the presidency for four more years.