Environmental Protection Agency Administrator Scott Pruitt has used EPA-funded security for personal trips, Sen. Sheldon Whitehouse wrote in a letter to the agency’s inspector general.

Pruitt took his security detail with him to his home in Tulsa, Oklahoma; a family vacation at Disneyland in California; and the 2018 Rose Bowl game, Whitehouse wrote in the letter obtained by CNN.

The Rhode Island Democrat got the information from an unnamed source, he says in the letter. He said it calls into question why “significant agency resources are being devoted to administrator Pruitt’s ’round-the-clock security, even when he is traveling on non-official business.”

“While I consider matters of personal security to be extremely serious, personal security should never be used as a pretext to obtain special treatment,” he wrote.

For some, Whitehouse’s letter raises new concerns about the cost of Pruitt’s security detail and whether it is excessive.