David Clarke has resigned from his position as sheriff of Milwaukee County, Wis., and has yet to disclose what his plans are for the future.

His resignation was received Thursday afternoon and is effective at midnight.

Here's Milwaukee County Sheriff David A. Clarke's resignation letter. Story updating here: https://t.co/ZYqsmwLUUp pic.twitter.com/o7ZndbAdQM — Journal Sentinel (@journalsentinel) August 31, 2017

Clarke, a conservative who ran for sheriff as a Democrat, has been rumored to be planning a run for Democratic Sen. Tammy Baldwin's seat. However, Clarke told one radio host shortly after his resignation Thursday that is not why he left his position.

"I want to put this to a rest because it's becoming a distraction. No, I'm not running for Senate," Clarke told WISN-AM host Vicki McKenna. "Every time I turn around, I talk to people and say, ‘No, I'm not running for Senate, hang onto your money.'"

In May, Clarke said he was in talks about a position at the Department of Homeland Security though he never went on to work there.

"The position mentioned is a secretarial appointment. Such senior positions are announced by the Department when made official by the Secretary. No such announcement with regard to the Office of Public Engagement has been made," DHS responded in a statement in May.

A DHS spokesman confirmed to the Washington Examiner on Thursday evening that Clarke was not recently offered another position with the department.

If he had stayed on, Clarke would have sought re-election in November 2018.