Allegations of potential postal voting fraud and voter suppression have raised questions about the fairness of November's US presidential election, but what evidence is there to suggest these fears will be realised and influence the vote?

David Aaronovitch explores the prevalence of electoral fraud in America, and in a year when the polls suggest a tight race in several states, he asks what will happen if the election result is contested?

Contributors:

Anthony Zurcher, BBC North America reporter

Elaine Kamarck, director of the Center for Effective Public Management, Brookings Institution.

Professor Carol Anderson, Emory University, Atlanta

Professor Jamal Greene, Columbia University, New York

Team: Richard Fenton-Smith, Julie Ball and Kirsteen Knight