Donald Trump holding a rally at Trump National Doral as he tries to win back the keys to the White House. Political Scientist Dr. Susan McManus says there are rumors he may be tapping Senator Marco Rubio to be his running mate, but she doesn't expect the announcement to come tonight. The rally comes a day after Jill Biden was in Tampa stumping for support amid continued calls from Democratic lawmakers and donors for Biden to bow out of the race. It also comes less than a week before the Republican National Convention where the former president will be formally nominated to the GOP ticket.