Environmental Protection Agency chief Scott Pruitt’s concern with his safety came at a steep cost to taxpayers as his swollen security detail blew through overtime budgets and at times diverted officers away from investigating environmental crimes.

Altogether, the agency spent millions of dollars for a 20-member full-time detail that is more than three times the size of his predecessor’s part-time security contingent.

New details in Pruitt’s expansive spending for security and travel emerged from agency sources and documents reviewed by The Associated Press. They come as the embattled EPA leader fends off allegations of profligate spending and ethical missteps that have imperiled his job.