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Ben Carson said Sunday that he no longer wants to dismantle Medicare and defended the policy switch, while also responding to the latest attack from fellow Republican presidential candidate Donald Trump.

Carson, who leads Trump in Iowa, according to new polls, acknowledged that months ago he indeed wanted to end Medicare but said he changed his mind after talking to a lot of economists.

“That was the old plan,” Carson told “Fox News Sunday.” “That’s gone.”

Carson, a retired neurosurgeon, said he now prefers so-called health savings accounts as an alternative to Medicare, the government-subsidies medical insurance for retirees.

A Des Moines Register/Bloomberg Politics poll released Friday shows Trump now trailing Carson by 9 percentage points. And a Quinnipiac University poll released Thursday shows him trailing Carson by 8 percentage points among Republican voters in Iowa, partial to social conservative candidates.

On Saturday, Trump said that he is a Presbyterian, which he considers a middle-of-the-road religion. Carson is a Seventh Day Adventists, which some conservatives think are not Christians.

“Seventh-day Adventist, I don’t know about,” Trump said at campaign stop in Jacksonville, Fla. “I just don’t know about.”

Carson said Sunday that he hopes Trump will apologize, just like he did when he questioned Trump’s faith in September.

Trump told ABC’s “This Week” that he’s not apologizing because he didn’t say anything wrong. “I would certainly give an apology if I said something bad,” Trump said.

On Friday, Trump called Carson “super low energy.”

Carson said Sunday that he wouldn’t “get into the mud pit” with Trump.

He also said the news reports that his revised plan will end Medicare are “completely false” and are being put out to “scare” Americans.