Supporters of U.S. President Donald Trump attend a campaign rally at Capital Region International Airport in Lansing, Michigan U.S., October 27, 2020.

Marine One, carrying U.S. President Donald Trump, descends near rally attendees at The Villages Polo Club in The Villages, Florida, U.S., October 23, 2020.

Supporters of U.S. President Donald Trump wait ahead of his campaign event, in Lansing, Michigan, U.S., October 27, 2020.

People attend a campaign event by U.S. President Donald Trump at Eppley Airfield in Omaha, Nebraska, U.S. October 27, 2020.

Supporters of U.S. President Donald Trump attend a campaign event at Capital Region International Airport in Lansing, Michigan, U.S. October 27, 2020.

Supporters of U.S. President Donald Trump attend a campaign event at Capital Region International Airport in Lansing, Michigan, U.S. October 27, 2020.

U.S. President Donald Trump looks back at his supporters as he departs at the end of a campaign event at Eppley Airfield in Omaha, Nebraska, U.S. October 27, 2020.

Supporters of U.S. President Donald Trump show four fingers as they attend a campaign rally at Prescott Regional Airport in Arizona, U.S., October 19, 2020.

Supporters wearing Make America Great Again Hats look on as the U.S. flag waves before the start of a U.S. President Donald Trump's campaign event at Des Moines International Airport in Des Moines, Iowa, U.S., October 14, 2020.Carlos Barria. REUTERS

Supporters cheer as U.S. President Donald Trump holds a campaign rally at Middle Georgia Regional Airport in Macon, Georgia, U.S., October 16, 2020.

A volunteer checks the temperature of a supporter of U.S. President Donald Trump before entering for an election campaign rally at Orlando Sanford International Airport in Sanford, Florida, U.S., October 12, 2020.

U.S. President Donald Trump speaks during a campaign rally, his first since being treated for the coronavirus disease (COVID-19), at Orlando Sanford International Airport in Sanford, Florida, U.S., October 12, 2020.

A child dressed up as U.S. President Donald Trump waves during his campaign event in Martinsburg, Pennsylvania, U.S., October 26, 2020.

U.S. President Donald Trump reacts to the crowd while walking to the podium during a campaign event at the Waukesha County Airport in Waukesha, Wisconsin, U.S., on October 24, 2020.

Supporters hold the Holy Bible as U.S. President Donald Trump delivers remarks during a campaign event at the Pickaway Agriculture and Event Center in Circleville, Ohio, U.S., October 24, 2020.

Supporters of U.S. President Donald Trump attend a campaign rally at Ocala International Airport in Ocala, Florida, U.S., October 16, 2020.

U.S. President Donald Trump throws a face mask from the stage during a campaign rally, his first since being treated for the coronavirus disease (COVID-19), at Orlando Sanford International Airport in Sanford, Florida, U.S., October 12, 2020.

Supporters of U.S. President Donald Trump and members of the media attend a campaign rally at Pitt-Greenville Airport in Greenville, North Carolina, U.S., October 15, 2020.