Democratic presidential candidate former Vice President Joe Biden arrives at General Mitchell International Airport in Milwaukee.

Metropolitan Police are confronted by protestors as police carry away a handcuffed protestor along a section of 16th Street, Northwest, renamed Black Lives Matter Plaza, in Washing...

Protestors rally in Washington. US President Donald Trump is set to deliver his acceptance speech later Thursday night from the nearby White House South Lawn.

Democratic presidential candidate former Vice President Joe Biden speaks during the fourth day of the Democratic National Convention, at the Chase Center in Wilmington, Del.

In this image from video, Jill Biden is joined by her husband, Democratic presidential candidate former Vice President Joe Biden, after speaking during the second night of the Demo...

Workers wear personal protective equipment and are separated in pairs from fellow employees by plastic shields as they process ballots at a Board of Elections facility in New York....

US President Donald Trump speaks during a campaign rally in Charlotte, North Carolina.

Democratic presidential candidate Sen. Elizabeth Warren, D-Mass., left, speaks to Sen. Bernie Sanders, I-Vt., right as former Vice President Joe Biden watches during a Democratic p...

US President Donald Trump points as he leaves a campaign rally in Battle Creek, Michigan.

Democratic presidential candidate former Vice President Joe Biden speaks to local residents during a bus tour stop, in Mason City, Iowa.

US President Donald Trump gestures after speaking at a campaign rally in Sunrise, Florida.

US President Donald Trump picks up a girl for a photograph on the South Lawn of the White House in Washington before boarding Marine One for a short trip to Andrews Air Force Base,...

Democratic presidential candidate Sen. Kamala Harris, D-Calif., Sen. Bernie Sanders, I-Vt., center, and former Vice President Joe Biden all speak at the same time during a Democrat...

From left, Rep. Tulsi Gabbard, D-Hawaii, businessman Tom Steyer, Sen. Cory Booker, D-N.J., Sen. Kamala Harris, D-Calif., Sen. Bernie Sanders, I-Vt., former Vice President Joe Biden...

US President Donald Trump arrives to speak at a campaign rally at the Target Center in Minneapolis.

US President Donald Trump is greeted by a cheering crowd at the Target Center in Minneapolis, Minnesota.

A protester is removed after interrupting a Democratic presidential primary debate hosted by ABC at Texas Southern University in Houston.

Democratic presidential candidate Sen. Kamala Harris, D-Calif., visits the Bickford Senior Living Center in Muscatine, Iowa.

US President Donald Trump pauses as he speaks at a campaign rally at Williams Arena in Greenville, N.C.

An inflatable Baby Trump balloon towers over protestors during a rally in Orlando, Florida. A large group of protestors against US President Donald J. Trump were rallying near wher...