Senator Chuck Grassley of Iowa wants EPA Administrator Scott Pruitt to stop issuing “small refinery hardship exemptions” or step down from the job.

“I’ve supported Pruitt but if he pushes changes to RFS that permanently cut ethanol by billions of gallons he will have broken Trump promise & he should step down & let someone else do the job of implementing Trump agenda,” Grassley tweeted, after telling reporters on his weekly ag call, “I’m done playing around with this.”

Grassley was one of the four senators who met with President Trump last week to try and finally resolve differences over the RFS between corn ethanol and oil interests. In the call with reporters, EPA should make sure blend levels match statutory level of 15 billion gallons set by Congress or it will undo the benefits of allowing year-round E15. Grassley also said the EPA is “going to try” to make the summer vapor pressure waiver applicable this year.

Audio: Sen. Grassley ag call comments on RFS waivers

EPA Administrator Pruitt will appear before the Senate Appropriations Committee this morning 9:30 am Eastern to discuss the agency’s 2019 budget request.