 This is a special report from ABC News. Trump assassination attempt. I'm Chuck Sievertson. Trying to get Americans to cool down political hatred. President Biden talking to the nation from the White House. We may disagree. We are not enemies. We're neighbors. We're friends, co-workers, citizens. And most importantly, we're fellow Americans. There's no word yet on why the shooter, who was killed by a Secret Service sniper, opened fire at the rally in Butler, Pennsylvania, nicking Mr. Trump in an ear. ABC's Aaron Katursky.