FILE - Sen. Marco Rubio, R-Fla., speaks, June 14, 2024, in West Palm Beach, Fla. Rubio is a top contender to be selected as Republican presidential candidate former President Donald Trump's running mate. (AP Photo/Gerald Herbert, File)
FILE - Republican presidential candidate former President Donald Trump listens to questions during a presidential debate with President Joe Biden, Thursday, June 27, 2024, in Atlanta. The future Republican vice presidential candidate's plane is currently parked in an undisclosed airplane hangar, an empty spot on its fuselage for where a decal featuring his or her name will soon be placed. All that's left is an announcement from Trump on who he'll pick. (AP Photo/Gerald Herbert, File)
FILE - Republican presidential candidate former President Donald Trump, right, and North Dakota Gov. Doug Burgum attend a caucus night rally, Feb. 8, 2024, in Las Vegas. Burgum, who has grown close with the former president since he dropped his own bid for the nomination before voting began, is the third top contender for Trump's running mate. (AP Photo/Alex Brandon, File)
FILE - Sen. J.D. Vance, R-Ohio, right, points toward Republican presidential candidate former President Donald Trump at a campaign rally, March 16, 2024, in Vandalia, Ohio. Vance is a top contender to be selected as Trump's running mate. (AP Photo/Jeff Dean, File)