Top Republicans on a House committee want Environmental Protection Agency Administrator Gina McCarthy to tell them why her agency seems to be implementing the Clean Power Plan although the Supreme Court has blocked it.

In a letter to McCarthy Friday, House Energy and Commerce Committee Chairman Fred Upton, R-Mich., and Republican Reps. Ed Whitfield and Tim Murphy, of Kentucky and Pennsylvania, respectively, questioned why the EPA sent the proposed Clean Energy Incentive Program to the Office of Management and Budget for review.