President Donald Trump arrives to speak at a campaign rally at the Knapp Center on the campus of Drake University, Jan. 30, 2020, in Des Moines, Iowa. . (AP Photo/ Evan Vucci, File)
President Donald Trump speaks during a campaign rally at the Lake Charles Civic Center, Friday, Oct. 11, 2019, in Lake Charles, La. (AP Photo/Evan Vucci)
President Donald Trump boards Air Force One for a trip to Albuquerque, N.M. for a campaign rally, Monday, Sept. 16, 2019, at Andrews Air Force Base, Md. (AP Photo/Evan Vucci)
Republican presidential candidate Donald Trump holds a flag as he arrives to a campaign rally at the University of Northern Colorado, Sunday, Oct. 30, 2016, in Greeley, Colo. (AP Photo/Evan Vucci)
President Donald Trump arrives to speak at his reelection kickoff rally at the Amway Center, Tuesday, June 18, 2019, in Orlando, Fla. (AP Photo/Evan Vucci)
President Donald Trump gestures to the crowd as he finishes speaking at a campaign rally, Monday, May 20, 2019, in Montoursville, Pa. (AP Photo/Evan Vucci)
President Barack Obama speaks during Rutgers University's 250th Anniversary commencement ceremony, on Sunday, May 15, 2016, in Piscataway, N.J. (AP Photo/Evan Vucci) ** FILE **
President Donald Trump arrives at Tyndall Air Force Base to view damage from Hurricane Michael and attend a political rally, Wednesday, May 8, 2019, in Tyndall Air Force Base, Fla. (AP Photo/Evan Vucci)
Republican presidential candidate Donald Trump, left, stands with Democratic presidential candidate Hillary Clinton before the first presidential debate at Hofstra University, Monday, Sept. 26, 2016, in Hempstead, N.Y. (AP Photo/ Evan Vucci)
President Donald Trump arrives to speak at the Conservative Political Action Conference (CPAC), Friday, Feb. 24, 2017, in Oxon Hill, Md. (AP Photo/Evan Vucci)
A volunteer member of the advance team for President Donald Trump blocks a camera as a photojournalist attempts to take a photo of a protester during a campaign rally at the Ford Center, Thursday, Aug. 30, 2018, in Evansville, Ind. (AP Photo/Evan Vucci)
Secretary of Homeland Security Kirstjen Nielsen speaks during a roundtable on immigration policy with President Donald Trump at Morrelly Homeland Security Center, Wednesday, May 23, 2018, in Bethpage, N.Y. (AP Photo/Evan Vucci)
President Donald Trump speaks to the media before boarding Air Force One for a trip to Texas to meet with families of the Santa Fe school shooting victims, and to attend Republican fundraisers, Thursday, May 31, 2018, in Andrews Air Force Base, Md. (AP Photo/Evan Vucci)