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Sen. Lamar Alexander's chief of staff has been put on leave after law enforcement agents searched Ryan Loskarn's home for child pornography, the Tennessee Republican said Wednesday.

"I was just informed by the United States Senate legal counsel's office that law enforcement agents are conducting a search of the personal residence of Ryan Loskarn, the chief of staff of my Washington, D.C., office regarding allegations involving child pornography," Alexander said in a statement.

"I am stunned, surprised and disappointed by what I have learned. Based on this information, I immediately placed Mr. Loskarn on administrative leave without pay. The office is fully cooperating with the investigation," Alexander said.

Loskarn, 35, has worked for Alexander for more than a decade in several roles and became the senator's chief of staff last year. He earned about $169,000 for fiscal year 2013, according to records compiled by LegiStorm.

Loskarn previously served as staff director for the Senate Republican Conference, when Alexander was its chairman, and was a House aide for California and Tennessee lawmakers. He also worked for the House Rules Committee.