After a week of tension between the two Republican presidential candidates, front-runner Donald Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE took a shot at Sen. Ted Cruz Rafael (Ted) Edward CruzCruz blocks amended resolution honoring Ginsburg over language about her dying wish Trump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP MORE (R-Texas) on Friday, saying that “oil companies pay him a lot of money.”

“With ethanol [Cruz has] gotta come a long way,” Trump said in Des Moines, Iowa. "He’s right now for the oil. But I understand if oil pays him a lot of money, he’s gotta be for oil. Right?”

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“But I’m with you,” Trump told his supporters, noting he toured ethanol plants in Iowa last month.

"If Ted Cruz is against ethanol, how does he win in Iowa," Trump asked.

The billionaire businessman also slammed Cruz as a copycat.

“The one guy that is doing pretty good with me in Iowa is Ted Cruz,” Trump said. "Everything I say, he agrees with me. No matter what I say.”

He later seemed to take a shot at Cruz's background.

“I do like Ted Cruz, but not a lot of evangelicals come out of Cuba,” Trump said. “But I like him nonetheless.”

Trump chastised Cruz earlier in the day after the New York Times reported earlier this week that Cruz questioned the billionaire’s judgement at a closed-door fundraiser in Manhattan.

“[Ted Cruz] should not make statements behind closed doors to his bosses, he should bring them out in the open,” Trump wrote on Twitter. “More fun that way!”