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At tonight’s debate, former President Donald Trump repeated baseless claims, increasingly popular among Republicans, that there is mass noncitizen voting in the United States. It has been a persistent theme of the campaign—one that combines two of Trump’s main recurring grievances: anti-immigrant sentiment and the Big Lie.

“Our elections are bad,” Trump said. “And a lot of these illegal immigrants coming in, they’re trying to get them to vote. They can’t even speak English. They don’t even know what country they’re in practically. And these people are trying to get them to vote. And that’s why they’re allowing them to come into our country.”

Noncitizen voting is a non-issue, despite Republicans’ best efforts to make it one. Some of it goes back to a debunked video. In late July, the Oversight Project—a self-described “legal and investigative” group linked to the Heritage Foundation that purports to be “battling corruption and weaponization”—promoted a video with supposed evidence of widespread cases of noncitizens admitting to being registered voters. Behind the camera, a man introduces himself to residents of an apartment complex in Norcross, Georgia, saying he works at a company that helps Hispanic people register to vote. He goes on to ask them if they’re US citizens or not, and a handful of respondents appear to confirm that they are noncitizens who are registered to vote.

In the video, Anthony Rubin—the founder of the right-wing Muckraker website known........

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