Joe Biden, Democratic 2020 U.S. presidential candidate and former vice president, meets with families who have benefited from the Affordable Care Act and delivers remarks on health care during a campaign stop in Lancaster, Pennsylvania, U.S. June 25, 2020.

Campaign workers set up prior to Democratic U.S. presidential candidate and former Vice President Joe Biden's speech at a campaign event in Wilmington, Delaware, U.S., June 30, 2020.

Democratic presidential candidate and former Vice President Joe Biden wears a protective face mask as he tours the assembly line at McGregor Industries, a metal works plant that manufactures stairs and stair railings, in Dunmore, Pennsylvania, U.S., July 9, 2020.

Democratic U.S. presidential candidate and former Vice President Joe Biden talks to local residents as he visits the neighborhood where he grew up while campaigning in Scranton, Pennsylvania, U.S., July 9, 2020.

Attendees listen as Democratic U.S. presidential candidate and former Vice President Joe Biden speaks during a Biden campaign event at a recreation center in Lancaster, Pennsylvania, U.S., June 25, 2020.

Democratic U.S. presidential candidate and former Vice President Joe Biden puts his protective face mask back on after speaking and answering questions from reporters during a campaign event in Wilmington, Delaware, U.S., June 30, 2020.

Caliph Mathis II sanitizes the podium for Democratic U.S. presidential candidate and former Vice President Joe Biden, because of the coronavirus disease pandemic, before Biden arrived to speak about his plans for tackling climate change during a campaign event in Wilmington, Delaware, U.S., July 14, 2020.

Democratic U.S. presidential candidate and former Vice President Joe Biden meets with customers at the sports bar Carlette?s Hideaway during a campaign stop in Yeadon, Pennsylvania U.S., June 17, 2020.

Democratic U.S. presidential candidate and former Vice President Joe Biden arrives to speak about the Trump administration's handling of the coronavirus disease pandemic during a campaign event in Wilmington, Delaware, U.S., June 30, 2020.

A staff member disinfects the microphone before Democratic U.S. presidential candidate and former Vice President Joe Biden speaks during a Biden campaign event at a recreation center in Lancaster, Pennsylvania, U.S., June 25, 2020.

Democratic U.S. presidential candidate and former Vice President Joe Biden sits and talks with local residents about the effects of the coronavirus disease (COVID-19) pandemic on their small businesses on the outside patio of the Carlette’s Hideaway sports bar during a campaign stop in Yeadon, Pennsylvania U.S., June 17, 2020.

Democratic U.S. presidential candidate and former Vice President Joe Biden waves goodbye after talking to a young local child while surrounded by U.S. Secret Service agents and news media as he visits the neighborhood where he grew up while campaigning in Scranton, Pennsylvania, U.S., July 9, 2020.

Journalists maintain physical distance while Democratic U.S. presidential candidate and former Vice President Joe Biden speaks during a Biden campaign event at a recreation center in Lancaster, Pennsylvania, U.S., June 25, 2020.

Workers separated for social distancing because of the coronavirus (COVID-19) pandemic listen to Democratic U.S. presidential candidate and former Vice President Joe Biden as he speaks about the U.S. economy during a campaign event at McGregor Industries, a metal works plant that manufactures stairs and stair railings, in Dunmore, Pennsylvania, U.S., July 9, 2020.

Reporters sit chairs in circles marked for coronavirus disease pandemic social distancing as Democratic U.S. presidential candidate and former Vice President Joe Biden speaks about his plans for tackling climate change during a campaign event in Wilmington, Delaware, U.S., July 14, 2020.

Democratic U.S. presidential candidate and former Vice President Joe Biden speaks at a campaign event devoted to the reopening of the U.S. economy during the coronavirus disease (COVID-19) pandemic in Philadelphia, Pennsylvania, U.S., June 11, 2020.

Local residents waiting outside react as Democratic U.S. presidential candidate and former Vice President Joe Biden waves and gives them a thumbs up as he departs after a presidential campaign event held at a community center in Darby, Pennsylvania U.S., June 17, 2020.

Democratic U.S. presidential candidate and former Vice President Joe Biden gestures with his fist towards his head as he says he has not been tested for coronavirus because he has had no symptoms "as my mother would say, knock on wood" while answering questions from reporters during a campaign event in Wilmington, Delaware, U.S., June 30, 2020.

An attendee listens as Democratic U.S. presidential candidate and former Vice President Joe Biden speaks about the U.S. economy during a campaign event at McGregor Industries, a metal works plant that manufactures stairs and stair railings, in Dunmore, Pennsylvania, U.S., July 9, 2020.

U.S. Secret Service agents watch as democratic U.S. presidential candidate and former Vice President Joe Biden speaks at a campaign event devoted to the reopening of the U.S. economy during the coronavirus disease (COVID-19) pandemic in Philadelphia, Pennsylvania, U.S., June 11, 2020.

U.S. President Donald Trump's supporters gather outside an event for Joe Biden, Democratic 2020 U.S. presidential candidate and former vice president, before a campaign stop in Lancaster, Pennsylvania, U.S. June 25, 2020.

Joe Biden, Democratic 2020 U.S. presidential candidate and former vice president, meets with families who have benefited from the Affordable Care Act and delivers remarks on health care during a campaign stop in Lancaster, Pennsylvania, U.S. June 25, 2020.

Democratic U.S. presidential candidate and former Vice President Joe Biden holds up his protective face mask as he speaks about the Trump administration's handling of the coronavirus pandemic during a campaign event in Wilmington, Delaware, U.S., June 30, 2020.

Democratic U.S. presidential candidate and former Vice President Joe Biden puts his protective face mask back on and adjusts it as he departs after speaking about President Donald Trump's response to the coronavirus disease (COVID-19) pandemic and answering questions from reporters during a campaign event in Wilmington, Delaware, U.S., June 30, 2020.

Democratic U.S. presidential candidate and former Vice President Joe Biden departs after speaking about the U.S. economy during a campaign event at McGregor Industries, a metal works plant that manufactures stairs and stair railings, in Dunmore, Pennsylvania, U.S., July 9, 2020.

Democratic U.S. presidential candidate and former Vice President Joe Biden talks to a young child while surrounded by U.S. Secret Service agents and news media as he visits the neighborhood where he grew up while campaigning in Scranton, Pennsylvania, U.S., July 9, 2020.

Democratic U.S. presidential candidate and former Vice President Joe Biden listens to Carlette Brooks as she wipes away tears and talks about the effects of the coronavirus disease (COVID-19) pandemic on her family and their small businesses on the outside patio of the Carlette’s Hideaway sports bar during a campaign stop in Yeadon, Pennsylvania U.S., June 17, 2020.

Workers separated for social distancing because of the coronavirus (COVID-19) pandemic listen to Democratic U.S. presidential candidate and former Vice President Joe Biden as he speaks about the U.S. economy during an outdoor campaign event at McGregor Industries, a metal works plant that manufactures stairs and stair railings, in Dunmore, Pennsylvania, U.S., July 9, 2020.

Democratic U.S. presidential candidate and former Vice President Joe Biden wears a protective face mask as he walks with Bob McGregor of McGregor Industries, a metal works plant that manufactures stairs and stair railings, while touring the assembly line of the company, in Dunmore, Pennsylvania, U.S., July 9, 2020.