A family member gets emotional at the Tunnel to Towers ceremony, Sept. 11, 2020, in New York. Vice President Mike Pence and his wife Karen will attend the ceremony where the names of nearly 3,000 victims of the Sept. 11, 2001 terror attacks will be read by family members. (AP Photo/Mark Lennihan)

Tribute in Light, two vertical columns of light representing the fallen towers of the World Trade Center shine against the lower Manhattan skyline on the 19th anniversary of the September 11, 2001 terror attacks, seen from Jersey City, N.J., Friday, Sept. 11, 2020. (AP Photo/Stefan Jeremiah)

Jo Anne Barbara cries while holding a frame collage of Ruben Correa, a fallen FDNY firefighter, at the National September 11 Memorial and Museum, Friday, Sept. 11, 2020, in New York. Americans will commemorate 9/11 with tributes that have been altered by coronavirus precautions and woven into the presidential campaign. (AP Photo/John Minchillo)

A woman wearing a flag mask joins others in prayer at the Tunnel to Towers ceremony, Sept. 11, 2020, in New York. Vice President Mike Pence and his wife Karen will attend the ceremony where the names of nearly 3,000 victims of the Sept. 11, 2001 terror attacks will be read by family members. (AP Photo/Mark Lennihan)

A mourner kisses a rose through her face mask before placing it in a name cut-out of the deceased at the National September 11 Memorial and Museum, Friday, Sept. 11, 2020, in New York. (AP Photo/John Minchillo)

Tribute in Light, two vertical columns of light representing the fallen towers of the World Trade Center shine against the lower Manhattan skyline on the 19th anniversary of the September 11, 2001 terror attacks, seen from Jersey City, N.J., Friday, Sept. 11, 2020. (AP Photo/Stefan Jeremiah)

Mourners hug beside the names of the deceased Jesus Sanchez and Marianne MacFarlane at the National September 11 Memorial and Museum, Friday, Sept. 11, 2020, in New York. Americans commemorated 9/11 with tributes that have been altered by coronavirus precautions and woven into the presidential campaign. (AP Photo/John Minchillo)

President Donald Trump and first lady Melania Trump stand during the Pledge of Allegiance at a 19th anniversary observance of the Sept. 11 terror attacks, at the Flight 93 National Memorial in Shanksville, Pa., Friday, Sept. 11, 2020. (AP Photo/Alex Brandon)

U.S. Army Sgt. Edwin Morales, center right, salutes after placing flowers for fallen FDNY firefighter Ruben D. Correa at the National September 11 Memorial and Museum, Friday, Sept. 11, 2020, in New York. The names of nearly 3,000 victims of the Sept. 11, 2001 terror attacks will be read by family members at a ceremony organized by the Tunnel to Towers Foundation. (AP Photo/John Minchillo)

Democratic presidential candidate former Vice President Joe Biden greets Vice President Mike Pence at the 19th anniversary ceremony in observance of the Sept. 11 terrorist attacks at the National September 11 Memorial & Museum in New York, on Friday, Sept. 11, 2020. (Amr Alfiky/The New York Times via AP, Pool)

Democratic presidential candidate and former Vice President Joe Biden carries a wreath as he walks with his wife Jill Biden during a visit to the Flight 93 National Memorial in Shanksville, Pa., Friday, Sept. 11, 2020, to commemorate the 19th anniversary of the Sept. 11 terrorist attacks. (AP Photo/Patrick Semansky)

Tribute in Light, two vertical columns of light representing the fallen towers of the World Trade Center shine against the lower Manhattan skyline on the 19th anniversary of the September 11, 2001 terror attacks, seen from Jersey City, N.J., Friday, Sept. 11, 2020. (AP Photo/Stefan Jeremiah))

President Donald Trump and first lady Melania Trump pause for a moment of silence on Air Force One as he arrives at the airport in Johnstown, Pa., on his way to speak at the Flight 93 National Memorial, Friday, Sept. 11, 2020, in Shanksville, Pa. (AP Photo/Alex Brandon)