 the shooter and his motives, and there are questions about the security, how the Secret Service wasn't able to prevent this. That's Washington Post national political reporter Isaac Arnsdorf. Quick look now at the top stories we're working on at WTOP. The White House says President Biden will address the nation tonight on the Trump rally shooting. It comes after he delivered remarks about an hour ago. We don't yet have any information about the motive of the shooting.