By Joe Davidson
The Washington Post

Leaving can be liberating.

Republican Sens. Bob Corker (Tenn.) and Jeff Flake (Ariz.) have demonstrated that with their caustic criticisms of President Trump.

Now it’s John Koskinen’s turn.

Thursday is his last day as commissioner of the Internal Revenue Service, allowing his bluntness about Congress on Tuesday.

He started with a veiled dig near the end of his prepared statement during a briefing with reporters…

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