Ahead of the US midterm elections on 3 November, President Trump continues to make unsubstantiated claims that mail-in voting leads to widespread fraud.
US states have different voting rules and regulations - but every state allows some postal voting, a method the president says he has used in the past.
BBC Verify visited an election centre in Maryland to get a behind-the-scenes look at how mail-in ballots are processed and counted.
Produced by Mabel Pickering. Graphics by Sally Nicholls.
Source: BBC News
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