text:  Welcome to NewsHour from the BBC World Service. Hello, I'm James Menendez. Today, big questions for NATO leaders meeting in Washington, D.C. for their 75th anniversary summit. Will they help Ukraine stop missile attacks like the one that struck a children's hospital? And what would a second Trump presidency mean for the alliance? I don't think he wants to withdraw from NATO, but he has said that the United States should re-evaluate its role and the purpose of NATO going forward.