Donald Trump and his Republican allies have repeatedly claimed that the Democrats are planning to get illegal immigrants to vote in the US election.

“Our elections are bad, and a lot of these illegal immigrants coming in, they’re trying to get them to vote,” Trump said during the presidential debate with Kamala Harris.

BBC Verify has identified more than 100 paid-for ads on Facebook and Instagram posted by Republicans since the start of September focusing on the issue.

It is illegal for a non-US citizen to vote in a national election, but studies suggest cases of this actually happening are very rare.