DAVID MUIR: We turn now to the race for The White House. Just 12 days now until Election Day but tonight, this number: more than 30 million Americans have already voted in early voting. Both Kamala Harris and Donald Trump tonight in the key battleground states. And tonight, former President Trump vowing, if elected, he will fire Jack Smith, who is prosecuting Trump for allegedly trying to overthrow the results of the last election, and the horror on January 6th. And after CNN invited both Kamala Harris and Donald Trump to a debate or to a town hall, Trump saying no to both, Harris showing up to make her case in front of undecided voters in Pennsylvania. And what she promised. Here's ABC's Mary Bruce.