At Mount Rushmore, Trump digs deeper into nation's divisions

President Donald Trump smiles at Mount Rushmore National Memorial, Friday, July 3, 2020, near 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)

Native American protesters form a roadblock on the road leading to Mount Rushmore ahead of President Donald Trump's visit to the memorial on Friday, July 3, 2020, in Keystone, S.D. (AP Photo/Stephen Groves)

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

Protesters clash with a line of law enforcement officers in Keystone, S.D., on the road leading to Mount Rushmore ahead of President Donald Trump's visit to the memorial on Friday, July 3, 2020. (AP Photo/Stephen Groves)

President Donald Trump, accompanied by first lady Melania Trump, stands during the national anthem with a flyover by the U.S. Navy Blue Angles at Mount Rushmore National Memorial, Friday, July 3, 2020, near Keystone, S.D. (AP Photo/Alex Brandon)

Fireworks light the sky at Mount Rushmore National Memorial, Friday, July 3, 2020, near Keystone, S.D., after President Donald Trump spoke. (AP Photo/Alex Brandon)

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

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

Protesters clash with a line of law enforcement officers in Keystone, S.D., on the road leading to Mount Rushmore ahead of President Donald Trump's visit to the memorial on Friday, July 3, 2020. (AP Photo/Stephen Groves)

President Donald Trump watches a flyover by the U.S. Navy Blue Angles at Mount Rushmore National Memorial, Friday, July 3, 2020, near Keystone, S.D. (AP Photo/Alex Brandon)

Native American protesters demonstrate in Keystone, S.D., ahead of President Donald Trump's visit to the memorial Friday, July 3, 2020. Protesters are advocating for the Black Hills to be returned to the Lakota people. (AP Photo/Stephen Groves)