Voters in Wisconsin, Michigan, Minnesota and Pennsylvania are allowed to void their early or absentee ballots and cast a new vote. While normally not an issue, that could end up playing a bigger role this year, with October surprises and each campaign fighting vigorously to disqualify the other.

Dan Scavino, who handles social media for Donald Trump, sent out a tweet on Tuesday telling early or absentee voters in the four states there was still time to switch if they regretted voting for Mrs. Clinton.

“Feeling duped?” he said in his invitation for do-overs.

He also posted voter hotlines for each state and deadlines for switching. Minnesota’s deadline was the close of business Tuesday, while Wisconsin’s is Thursday and Michigan’s is Monday.