(Washington, DC)  --  Representative Greg Walden says he has serious questions about EPA administrator Scott Pruitt's management of the agency.  During a House hearing yesterday, the Oregon Republican said he's concerned that the good progress being made on policy in the EPA is being undercut by allegations about Pruitt's misuse of agency resources.  Walden added that members on both sides of the aisle have serious questions, and they expect these questions to be answered fully and truthfully.  Pruitt insisted at the hearing that he has nothing to hide, but he's recently come under fire for having a 43-thousand-dollar soundproof phone booth installed in his office.  Pruitt is also catching heat over questionable housing arrangements and the expenditure of tens of thousands of dollars of taxpayer money on first class air travel.