MADISON, Wis. — Dozens of 17-year-olds voted illegally across Wisconsin during last spring’s intense presidential primary, apparently wrongly believing they could cast ballots if they turned 18 ahead of the November general election, according to a new state report.

The state Elections Commission staff examined voter fraud referrals municipal clerks said they made to prosecutors after the 2016 spring primary and general elections. The commission is set to approve the findings during a meeting Tuesday and forward a report to the Legislature.

President Trump has called for a ‘‘major investigation’’ into voter fraud and alleged that 3 million to 5 million people may have voted illegally in the November general election, a widely debunked claim. The report lists no instances of underage voters casting ballots in the general election.

Republican Ted Cruz won the GOP primary in Wisconsin. Bernie Sanders won the Democratic contest. The state ultimately voted for Trump in the November general election.

The teenagers were likely encouraged to go to the polls by social media messages saying 17-year-olds can vote in some states as long as they turn 18 before the November election, the report said.

Associated Press