His target was Democratic voters who have cast their ballot for Hillary Clinton but may be having a bad case of "buyer's remorse," he said, calling his suggestion a "public service announcement."
"In other words, you want to change your vote," he said at a Tuesday campaign rally in Eau Claire, Wisconsin. "So if you live here or in Michigan or Pennsylvania or Minnesota, you can change your vote to Donald Trump. We'll make America great again."
Trump is right that these states are among those with obscure laws allowing some people to change their vote, though it's not easy. And the rules are sometimes buried in state election laws and not easily searchable on state voting websites. Here's what we know:
WisconsinVoters have a right to three ballots in Wisconsin, according to state law. If they vote at the polls or absentee, they are allowed to cancel their ballot if they believe they made the wrong choice. "Any elector who, by accident or mistake, spoils or erroneously prepares a ballot may receive another by returning the defective ballot but not to exceed three ballots in all," state law reads.
The use of "any elector" indicates the law is applicable to people voting absentee.
MinnesotaVoters in Minnesota no longer have the option of changing their votes. But they did as of the close of business day Tuesday. Voters have until the close of business one week before Election Day to do so, according to rules on the Minnesota secretary of state's website.
"You can ask to cancel your ballot until the close of business one week before Election Day," it reads. "After that time, you cannot cancel your ballot. To cancel your ballot, contact the election office that sent your ballot. Your options are to have a new ballot mailed, vote in person at your local election office or vote at your polling place on Election Day."