A pair of senators is urging the White House Office of Management and Budget not to let the Environmental Protection Agency sully the reputation of hydraulic fracturing, or “fracking,” the controversial natural-gas drilling method.

Sens. Mary Landrieu (D-La.) and Rob Portman (R-Ohio) are asking OMB’s regulatory chief to ensure that EPA “reaches sound and well-supported scientific conclusions” when finalizing an explosive draft report that linked fracking to groundwater contamination in a Wyoming region.