A voter (C) casts his ballot in the U.S. presidential election in Dixville Notch, New Hampshire, the United States, on Nov. 3, 2020. Election Day voting kicked off in the United States early Tuesday morning with first ballots cast in the northeastern state of New Hampshire. (Photos: Xinhua)

Windows and doors are boarded up in preparation for possible election-related protest or looting in Beverly Hills, Los Angeles County, the United States, Nov. 2, 2020. Election Day voting kicked off in the United States early Tuesday morning.

Photo taken on Nov. 2, 2020 shows the White House in Washington, D.C., the United States. Election Day voting kicked off in the United States early Tuesday morning.

Windows and doors are boarded up in preparation for possible election-related protest or looting in Beverly Hills, Los Angeles County, the United States, Nov. 2, 2020. Election Day voting kicked off in the United States early Tuesday morning with first ballots cast in the northeastern state of New Hampshire.

Windows and doors are boarded up in preparation for possible election-related protest or looting in Beverly Hills, Los Angeles County, the United States, Nov. 2, 2020. Election Day voting kicked off in the United States early Tuesday morning with first ballots cast in the northeastern state of New Hampshire.

Reporters work near the White House in Washington, D.C., the United States, Nov. 2, 2020. Election Day voting kicked off in the United States early Tuesday morning with first ballots cast in the northeastern state of New Hampshire.

(201103) -- WASHINGTON, Nov. 3, 2020 (Xinhua) -- Photo taken on Nov. 2, 2020 shows the Washington Monument in Washington, D.C., the United States. Election Day voting kicked off in the United States early Tuesday morning with first ballots cast in the northeastern state of New Hampshire.

Municipal workers wrap up the iconic statue at the entrance of the well-known Rodeo Drive in Beverly Hills to prevent it from being damaged in possible election-related protest or looting in Los Angeles County, the United States, Nov. 2, 2020. Election Day voting kicked off in the United States early Tuesday morning with first ballots cast in the northeastern state of New Hampshire.