In addition, all 435 seats of the House of Representative are up for grabs and 35 of the 100 seats in the Senate.

The US Elections Project estimates that nearly 98 million Americans have voted early, a number that represents more than 71 percent of all votes cast in 2016. More than 63 million Americans are estimated to have cast their ballot by mail.

On Monday, many of the final polls rolled in and showed the close race between Trump and Biden has further tightened nationally and in battleground states such as Florida, North Carolina, Pennsylvania, Michigan, Georgia and Wisconsin.