 NATO is the strongest defensive alliance in history, and today it is bigger, stronger, better resourced, and more united than ever before, in large part due to President Biden's leadership over the past three years. The summit comes at a critical time for Biden as he's under pressure to show he's fit to serve another four years as president, following his faltering debate performance against Donald Trump that prompted some to call on Biden to drop out of the election. The president will hold a press conference Thursday to close the summit out.