Environmental Protection Agency Administrator Scott Pruitt is getting hit from all sides over his handling of the nation’s ethanol mandate and the potential for major changes to the program.

“We are on the verge of seeing 4 percent annualized GDP — something your detractors said would never happen,” Dan Eberhart, a Trump donor and president of Canary, one of the largest oil services firms in the country, wrote in a letter to President Trump on Thursday.