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One of the questions that's being asked on election day is what might happen if the results are contested? Both candidates have a right to demand a recount in most states, usually if the result there is tight.

There's been a surge in postal voting this year, and it's also possible that the validity of these ballots could be challenged in court.

Both campaigns have said they're already preparing for legal disputes after election day.

Philippa Thomas has been speaking to Prof. Alan Dershowitz, professor emeritus of Harvard Law School and Jessica Levinson, who is the director of Loyola Law School at the Public Service Institute in Los Angeles. What might happen if President Trump declares victory on an apparent slim margin, before all the votes are counted?

Photo shows: Voters in Virginia cast their ballots in the US election 2020, November. Credit: EPA