Sheriff David Clarke encountered Dan Black on an airplane in Dallas January of last year. Black asked if Clarke was the notorious sheriff, which Clarke explained he was. Black moved towards the back of the plane shaking his head. Clarke asked Black if he had a problem and Black shook his head no. There was no further interaction on the plane. But after the two came off the plane, Black was taken into custody by six deputies waiting at the gate for him.

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Court documents released today revealed that the FBI has executed a search warrant on Clarke’s Google email address [email protected] and the sheriff’s department for text messages exchanged. The court documents allege that Clarke instructed his deputies to go after Black.

Robert Snell of the Detroit News discovered the court filings in the clerk’s office Friday.

SCOOP: FBI investigating former Milwaukee County Sheriff David Clarke, a Donald Trump surrogate, according to search warrant affidavit I just stumbled upon. Heads up @journalsentinel @realDonaldTrump pic.twitter.com/13nZkpA6TW — Robert Snell (@robertsnellnews) December 29, 2017

According to the search warrant, Black filed a complaint against the now-former Sheriff Clarke, claiming the department unlawfully detained him after their interaction on the plane.

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FBI is reading Sheriff David Clarke’s text messages to staff, according to search warrant affidavit. Here’s one exchange after incident at airport pic.twitter.com/V6e80FBXZB — Robert Snell (@robertsnellnews) December 29, 2017

Here’s what the FBI was looking for in Sheriff David Clarke’s emails pic.twitter.com/OT4gli7YNw — Robert Snell (@robertsnellnews) December 29, 2017

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Here’s a bit about the law at issue in the Sheriff David Clarke investigation pic.twitter.com/1jQFuWzEgS — Robert Snell (@robertsnellnews) December 29, 2017

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Snell also posted the full affidavit from Clarke. It is now a “civil rights investigation” according to the documents.

At one time, Clarke was being considered for Homeland Security Secretary for President Donald Trump’s administration.