Watch: How US mail-in ballots are secured and counted for the midterm election

Forward of the US midterm elections on 3 November, President Trump continues to make unsubstantiated claims that mail-in voting results in widespread fraud.

US states have completely different voting guidelines and laws – however each state permits some postal voting, a way the president says he has used prior to now.

BBC Confirm visited an election centre in Maryland to get a behind-the-scenes take a look at how mail-in ballots are processed and counted.

Produced by Mabel Pickering. Graphics by Sally Nicholls.