Donald Trump speaks during a campaign rally at the University of Wisconsin at Eau Claire on Nov. 1. (Matt Rourke/AP)

EAU CLAIRE, Wis. — Donald Trump made what he called a “public service announcement” during a rally in this college town on Tuesday evening, telling Wisconsin voters who cast early ballots for Democrat Hillary Clinton that they can legally change their votes.

“A lot of things have happened over the last three days,” Trump said at a rally in Eau Claire on Tuesday evening. “This is a message for any Democratic voters who have already cast their ballots for Hillary Clinton and who are having a bad case of buyer's remorse — in other words, you want to change your vote — Wisconsin is one of several states where you can change your early ballot if you think you've made a mistake. A lot of stuff has come out since you voted.”

Trump told the crowd that voters in Pennsylvania, Minnesota or Michigan can also change their early votes from Clinton to Trump. Trump's campaign circulated this information earlier in the day on Twitter, with his director of social media tweeting out phone numbers that voters in each state can call to change their vote.

The “a lot of stuff” that Trump is talking about likely includes the letter that FBI Director James B. Comey sent to lawmakers on Friday, announcing that he had become aware of additional emails that might be related to the investigation into the private email server that Clinton used while secretary of state. Trump has also been highlighting tidbits of information from emails related to Clinton that were released by WikiLeaks.

But it's unlikely that Trump's newest voter outreach effort will net many votes, as there's no evidence that many voters who were motivated enough to vote early will change their minds. A Washington Post-ABC News tracking poll released Sunday found that most voters didn't think Comey's letter would make them less likely to vote for Clinton — and two-thirds of those who said that it did were Republicans. A poll from Politico and Morning Consult had similar results.

Philip Bump contributed to this report.