President Donald Trump speaks as he tours an emergency operations center and meets with law enforcement officers at Mary D. Bradford High School, Tuesday, Sept. 1, 2020, in Kenosha, Wis. (AP Photo/Evan Vucci)

Democratic presidential candidate former Vice President Joe Biden puts on his face mask after speaking to media in Wilmington, Del., Friday Sept. 4, 2020. (AP Photo/Carolyn Kaster)

President Donald Trump, Attorney General William Barr and acting Homeland Security Secretary Chad Wolf arrive at Andrews Air Force Base after a trip to Kenosha, Wis., Tuesday, Sept. 1, 2020, at Andrews Air Force Base, Md. (AP Photo/Evan Vucci)

President Donald Trump arrives for a news conference in the James Brady Press Briefing Room at the White House, Friday, Sept. 4, 2020, in Washington. (AP Photo/Evan Vucci)

Democratic presidential candidate former Vice President Joe Biden pauses as he speaks in Wilmington, Del., Friday Sept. 4, 2020. (AP Photo/Carolyn Kaster)