 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 is 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.