 Live from NPR News in Washington, I'm Dave Mattingly. President Biden and former President Donald Trump will be facing off tonight in their first debate of the 2024 campaign. NPR's Elena Moore says Biden and Trump will take questions for 90 minutes. The debate kicks off at 9 p.m. Eastern time. It's hosted by CNN at their studio in Atlanta, the first time in decades that a private media company is organizing a presidential debate. And the rule