Sheriff David Clarke submitted his resignation letter this afternoon to the Milwaukee County Clerk, George Christenson, on Thursday afternoon. The Milwaukee Journal Sentinel reports that Clarke is currently attending a convention of the National Fraternal Order of Police in Nashville.

The resignation letter says:

"Pursuant to Wis. Stat. 17.01, this communication is submitted as the notice of my resignation as Sheriff of Milwaukee County commencing Aug. 31, 2017, at 11:59 p.m."

Here is the letter:

How incredibly odd. He is at a police conference and quits, abruptly, with no notice and no reason given. Twitter is just as confused.

I suspect something big is going to break and he wanted to quit beforehand. Others agree:

Other possible ideas:

Fox News job. Trump White House job. Book tour.

Any other ideas, readers? Add to comments!

We will update this post as more details come out.