Democratic presidential nominee Joe Biden

NEW YORK, NEW YORK – SEPTEMBER 11: Democratic Presidential Candidate Joe Biden attends a 9/11 memorial service at the National September 11 Memorial and Museum on September 11, 2020 in New York City. The ceremony to remember those who were killed in the terror attacks 19 years ago will be altered this year in order to adhere to safety precautions around COVID-19 transmission. (Photo by Michael M. Santiago/Getty Images)