Former First Lady Michelle Obama will visit Miami later this month as part of a nationwide tour of at least a dozen cities to urge people to register to vote and to drive up turnout in the midterm election.

Mrs. Obama will be in Miami, her only Florida appearance, on Friday, Sept. 28, as part of a national week of action timed to coincide with National Voter Registration Day on Sept. 25. Details have not been disclosed.

"It's not enough to just vote for president every four years," said Mrs. Obama, co-chair of When We All Vote, a group urging more people to become voters and get politically engaged.

The group said that in the last midterm in 2014, 36.4 percent of eligible voters cast ballots, the lowest percentage since World War II.

Florida's turnout was 50.5 percent four years ago.

Other leaders of When We All Vote include actor Tom Hanks, singer Janelle Monáe, NBA star Chris Paul and country music performers Faith Hill and Tim McGraw.