The governor of ethanol-rich Iowa says voters there should reject Republican presidential candidate Ted Cruz Rafael (Ted) Edward CruzLoeffler calls for hearing in wake of Netflix's 'Cuties' Health care in the crosshairs with new Trump Supreme Court list 'Parks and Rec' cast members hosting special reunion to raise money for Wisconsin Democrats MORE over his position on the federal renewable fuel mandate.

Speaking with with reporters Tuesday at the Iowa Renewable Fuels Summit, Gov. Terry Branstad (R) said voters should oppose Cruz when they turn out to caucus next month, calling him the “biggest opponent of renewable fuels” in the presidential race.

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“He’s heavily financed by Big Oil,” Branstad said, according to the Des Moines Register. “So we think once Iowans realize that fact, they might find other things attractive but he could be very damaging to our state.”

Cruz "hasn’t supported renewable fuels, and I think it would be a big mistake for Iowa to support him,” he added. Asked whether he wanted to see Cruz defeated, Branstad said “yes.”

Wow, the highly respected Governor of Iowa just stated that "Ted Cruz must be defeated." Big shoker! People do not like Ted. — Donald J. Trump (@realDonaldTrump) January 19, 2016

Cruz has come under fire for his position on the Renewable Fuel Standard (RFS), which mandates the amount of ethanol refiners mix into their gasoline supply.

The Texas senator says he backs a five-year phase-out of the standard, though in the past he has supported measures to immediately end the RFS.

“I do believe there should be a gradual phase-out because there has been investment-based expectations,” Cruz said earlier this month.

“The lobbyists are trying the best they can to snooker the people of Iowa and convince the people of Iowa that a government mandate is the only way for ethanol to survive. The problem is, the government is blocking ethanol. They are trying to convince you the mandate is the best way to go.”

The mandate has strong support in Iowa, the nation’s leading ethanol producer. Since Congress instituted the RFS, every Iowa caucuswinner on both sides of the aisle has supported the mandate.

Cruz is in a tight race in Iowa with businessman Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE, who supports the mandate. Both are courting the same demographic of voter in the Hawkeye State, and Trump officials say the mandate could prove a tie-breaker with voters there.