State investigators have questioned the Manhattan Democratic representative on the city’s Board of Elections, who was caught on a secret video claiming Mayor de Blasio’s municipal ID program was contributing to “all kinds of fraud.”

The state Board of Elections investigative unit subpoenaed Manhattan Commissioner Al Schulkin to explain his bombshell comments, recorded by an undercover muckraker for the conservative Project Veritas.

In the video, Schulkin also talks about people in minority neighborhoods being bused to different polling sites, while questioning where “thousands of absentee ballots” originated.

“It’s absurd. There is a lot of fraud. Not just voter fraud, all kinds of fraud … This is why I get more conservative as I get older,” Schulkin said on the videotape.

Shulkin was interviewed Tuesday by state investigators, sources said.

He could not be reached for comment.

But sources familiar with the subpoena said the commissioner was not happy about being summoned and grilled.

Mayor de Blasio has called for Schulkin’s resignation, saying he was spreading falsehoods about the city’s ID program