Milwaukee County Sheriff David Clarke has resigned

David Clarke resigned abruptly from his long-standing post as Milwaukee County Sheriff on Thursday afternoon.

WTMJ-TV's Steve Chamraz first broke the story Thursday. "I was not given any advance notice of this, as you can imagine my phone has been ringing off the hook".

Clarke was recently in the running for a high-level position at the Department of Homeland Security.

Clarke gave no reason for his resignation in a one-paragraph letter to the county clerk that was obtained by NBC News.

On Sunday, President Trump promoted Clarke's book, "Cop Under Fire: Moving Beyond Hashtags of Race, Crime and Politics for a Better America". The investigation stems from an incident at the Milwaukee airport, where Clarke ordered on-duty deputies to come shake down a fellow passenger who had stared him down and expressed distaste for the radical conservative sheriff.

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Clarke has risen to national prominence in recent years, largely due to his appearances on conservative media programs and provocative social media posts.

In June, DHS said Clarke wasn't a candidate.

Clarke described "A war between rule of law and anarchy-seeking hate". Tammy Baldwin, a Democrat, but he repeatedly rejected their overtures. Clarke said in response that he'd withdrawn his name from consideration. Clarke spoke at the 2016 Republican National Convention in Cleveland, Ohio.

He was hit by allegations in May that he plagiarized content in his master's thesis on homeland security, which he denied. He has been vocal about gun rights and critical of what he called the "hateful ideology" of the Black Lives Matter movement, saying at times, "Stop trying to fix the police, fix the ghetto".

In January, after four inmate deaths in county jails, County Supervisor Supreme Moore Omokunde urged Clarke to resign.