The Environmental Protection Agency’s (EPA) recent proposal to lower renewable fuels blending requirements “flies in the face of the law,” Iowa Sen. Joni Ernst said last week at a Senate hearing on the agency’s management of the Renewable Fuels Standard (RFS) program.

“When passed by Congress, the original intent of the RFS was to create consumer choice for clean fuel by spurring investment in research, pro­duction and in­­frastructure,” Ernst said at the Senate Home­land Security and Governmental Affairs Committee hearing. “Un­­fortunately, the EPA is now using the lack of infrastructure as an excuse for setting biofuels levels lower than originally mandated, which flies in the face of the law.”

When Congress passed the RFS in 2005, ...