The Environmental Protection Agency is overstepping its authority if it continues to enforce Obama administration-era environmental rules for uranium mining, said Sen. John Barrasso, R-Wyo., in a letter to the agency.

Barrasso, chairman of the Senate Environment and Public Works Committee, sent a letter to EPA Administrator Scott Pruitt on Thursday, asking him to take immediate steps to eliminate duplicative environmental regulations requiring ground water monitoring by “in situ” uranium mine operators that inject water into the earth to pump the uranium to processing facilities.