Writing to FBI Director Christopher A. Wray and acting assistant attorney general John Cronan, the lawmakers said Pruitt had used his office for "the personal gain of himself and his family, in violation of federal law".
"Scott Pruitt can not shift the blame for his scandals to his aides or career EPA employees, said Democratic Representative Don Beyer, a member of the House Natural Resources Committee".
Trump signaled he still supports Pruitt on Friday but stressed that he's not "blameless".
Kaptur told her committee colleagues that "taxpayers entrust us to spend their money wisely, and I can not imagine there are many of our citizens who think that $130 vanity pens are worthy investments".
The company and the EPA did not immediately respond to requests for comment from Reuters.
"Outside he's being attacked viciously by the press and I'm not saying he's blameless, but we'll see what happens", Trump said. Pruitt also used agency employees to help him find housing in Washington, and previously has faced criticism for an unusual arrangement in which he rented a room from the wife of a lobbyist who worked with the EPA but paid only for nights he slept in the Capitol Hill apartment.
Federal ethics codes prohibit having staffers conduct personal errands and bar officials from using their position for private gain. Paul Rauser, who has reportedly been retained by Pruitt amid the mounting investigations, did not return a phone call and email seeking comment. "There's significant changes happening not only at the EPA but across the administration and it's needed", Pruitt told a reporter from Nextstar TV in Washington. There have been additional stories this week about how Pruitt directed an aide to hunt for a used Trump hotel mattress and his security detail to find him a certain lotion only available at Ritz-Carlton hotels, presumably inspired by the time he spoke to the National Mining Association at the hotel in April of a year ago.