House Energy and Commerce Committee Democrats are pressing the Republican leadership to force Environmental Protection Agency chief Scott Pruitt to testify under oath when he comes before the panel next week.

“Mr. Pruitt’s extraordinary lack of responsiveness to congressional inquiries, legal violations resulting from EPA’s failure to notify Congress about his expenditures, and serious questions about the veracity of his statements regarding a number of these ethics issues make this request necessary,” the committee’s top Democrats said in a letter sent Thursday to committee Chairman Greg Walden of Oregon, and the chairman of the environmental subcommittee , Rep. John Shimkus, R-Ill.