Donald TrumpDonald TrumpRomney blasts end of filibuster, expansion of SCOTUS McConnell, GOP slam Biden's executive order on SCOTUS US raises concerns about Iran's seriousness in nuclear talks MORE slammed fellow 2016 Republican presidential candidate Ben CarsonBen CarsonCOVID-19 homelessness is a public health problem — it's about to get worse Marcia Fudge — 'The Fixer' — will take on HUD Biden administration buys 100,000 doses of Lilly antibody drug MORE for questioning his faith, calling the retired pediatric neurosurgeon an "OK doctor" who was "heavy into the world of abortion."

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“Who is he to question my faith?” Trump asked host Chris Cuomo on CNN’s “New Day.” “He knows nothing about me.

“I am a man of faith,” he continued. “I hardly know Ben Carson. I’m a believer, big league in God. I will hit back on that.

“I don’t think he’s a great religious figure,” Trump added. “If you look at his faith, you’re not going to make it very far.” 

Trump argued on Thursday that Carson’s medical background undermines his claims about his spiritual convictions.

“He was an OK doctor,” he said. “He was heavy into the world of abortion.”

Carson questioned the sincerity of Trump’s spirituality during an interview on Wednesday evening.

“I realize where my successes come from, and I don’t in any way deny my faith in God,” he told listeners during a campaign rally in Anaheim, Calif.

“I think that’s the big differentiator,” Carson added, comparing himself to Trump.

“That’s a very big part of who I am — humility and fear of the Lord. I don’t get that impression from him.”

“When Ben Carson makes a phony statement, I am going to attack him.” Trump said on Thursday. “Ben Carson is not going to be the next president, that I can tell you.

“He makes Bush look like the energizer bunny,” he added, taunting Carson’s soft-spoken persona and former Gov. Jeb Bush (R-Fla.), another GOP presidential rival, at the same time.

Trump’s war of words with Carson comes as he leads the retired doctor and other Republicans in the race for their party’s presidential nomination next year. 

Carson currently ranks second place after Trump in the hunt for next year’s Republican presidential nomination across multiple national polls.

The real estate tycoon earns 29.8 percent to Carson’s 16 percent voter support, according to the latest RealClearPolitics average of samplings.

--This report was updated at 8:22 a.m.