President Donald Trump speaks at Mount Rushmore National Monument Friday, July 3, 2020, in Keystone, S.D. (AP Photo/Alex Brandon)

Trump supporters, some who were blocked from reaching Mount Rushmore by a blockade set up by Native American protesters, gather near where protesters clashed with law enforcement officers in Keystone, S.D., Friday, July 3, 2020.. (AP Photo/Stephen Groves)

People shop for Trump memorabilia in Keystone, S.D. on Friday, July 3, 2020 ahead of a fireworks display at Mount Rushmore the president is expected to attend. (AP Photo/Stephen Groves)

President Donald Trump speaks to the press before boarding Air Force One, Friday, July 3, 2020, at Andrews Air Force Base, Md. Trump is en route to Mount Rushmore National Memorial. (AP Photo/Alex Brandon)

President Donald Trump and first Lady Melania Trump step off Air Force One upon arrival at Ellsworth Air Force Base, S.D., Friday, July 3, 2020. Trump is en route to Mount Rushmore National Memorial. (AP Photo/Alex Brandon)

President Donald Trump walks to speak to the press before boarding Air Force One, Friday, July 3, 2020, at Andrews Air Force Base, Md. Trump is en route to Mount Rushmore National Memorial. (AP Photo/Alex Brandon)