Sen. Lamar Alexander (R-TN) announced in a statement on Wednesday that law enforcement agents were searching the residence of his chief of staff, Ryan Loskarn, over allegations of child pornography.

Alexander said in a statement that he had placed Loskarn on administrative leave without pay.

“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 the 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.”