Tomorrow’s elections might be the most important of our lifetimes. The health care of millions is on the ballot. Making sure working families get a fair shake is on the ballot. The character of our country is on the ballot.
Some 34.3 million people have cast early ballots and the real number is probably higher, according to the US Elections Project, a University of Florida-based information source. That figure in 2014 was just 27.5 million.
In Texas, early voting has exceeded the entire turnout in 2014.
However, thunderstorms are forecast for Tuesday along the eastern coast, as well as snowstorms in the Midwest, which could affect turnout.
The first polls close at 18:00 EST (23:00 GMT).
What are the key issues?
During his final campaign rallies in Ohio, Indiana and Missouri, Mr Trump returned to his key campaigning issues, including insisting that Democrats would damage the economy and allow more illegal immigration.
Democratic candidates, meanwhile, have tended to avoid directly confronting the president, focusing instead on so-called “kitchen table” issues, such as healthcare and economic inequality.
The party hopes younger voters, suburban moderates and minorities will be drawn to the polls to react against the president’s rhetoric.
Mr Trump has faced widespread criticism for his divisive language.
On Monday, Facebook, NBC and even the Mr Trump’s favourite network, Fox News, announced they would stop broadcasting a 30-second ad paid for by his campaign, which featured an undocumented Mexican immigrant.