© Reuters/Jonathan Ernst
Sen. Lamar Alexander, R-Tenn., sent out a release Wednesday morning announcing that his chief of staff, Ryan Loskarn, is being put on leave over allegations involving child pornography. "I am stunned, surprised and disappointed by what I have learned," the senator said in a statement.

Loskarn is on leave without pay, and Alexander says his office is fully cooperating with the
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The investigation is being led the the the Postal Inspection Service.

Spokeswoman Lori McCallister tells National Journal that her agency conducted a "law enforcement" action in Southeast D.C. Wednesday morning. "All documents related to the law enforcement action are under seal," she said.

It wasn't long ago that things were looking rather good for Loskarn. A former staff director of the Senate Republican Conference, he was on Roll Call's 2009 "Fabulous 50 Movers and Shakers" on Capitol Hill list. He became Alexander's chief of staff at the end of 2011. Before then, he was the staff director of the Senate Republican Conference for more than two years and worked in the House as an aide for seven years for various Republican lawmakers.