Donald Trump told supporters at a rally in Wisconsin Tuesday night that if they voted early for Hillary Clinton and now regret their choice, they can do something about it.

They can take their vote back, he said.

Trump said his suggestion to voters who were not comfortable about their vote was a "public service announcement" and told them that if they voted for Clinton, they were in for years of turmoil as he believes she would face a drawn-out investigation if elected.

"She is likely to be under investigation for many years, probably concluding in a very large scale criminal trial," Trump said.

Trump was referring to FBI Director James Comey’s announcement that a set of emails had been discovered on former New York Rep. Anthony Weiner’s laptop that could be connected to the investigation of Clinton’s use of a private email server. Weiner is the estranged husband of Clinton’s longtime aide, Huma Abedin.

While Trump's call to take back the vote may sound odd, it is legal to change your votes in some states. Some of the states in which it is legal to change a vote are considered "battleground states," or states where voting totals can affect the outcome of the presidential election.

Trump’s social media director, Dan Scavino, was quick to offer help to voters doubting their choice. He tweeted information on state deadlines to change votes.

Voters in Michigan, Wisconsin and Minnesota were especially encourage by the Trump campaign to reconsider their vote if they voted for Clinton.

An estimated 24 million people have already voted in states that allow early or absentee voting.