Rep. Mark Sanford (R-S.C.) says he can't guarantee everyone who currently has health insurance will keep it under the GOP's ObamaCare replacement plan.

MSNBC host Chris Hayes on Monday night questioned whether Sanford could look his constituents in the eye and say, "You will be better off — I guarantee you, you're going to have care, you're going to have coverage if you have it now."

"I hate the issue of political guarantees, because they're ripped apart so quickly," Sanford said in response.

Sanford went on to say that in South Carolina, healthcare premiums increased by 29 percent last year.

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"We've gone from three providers down to one," he said.

"And so it's in something of a mathematic spiral and you could either sit on the sidelines and say let is fail at its own volition, leave it alone — which I think is probably, politically, would be the easier thing to do," he continued.

"Or you could say, 'Hey, here's some other remedies.' And what I think what's going to happen is the two ideas are going to get melded; you're probably going to have a bit of ObamaCare and you're probably going to have a bit more of a free market."

President Trump said Saturday that a plan to replace ObamaCare would come "in a couple of weeks."

We are going to be submitting in a couple of weeks a great healthcare plan that's going to take the place of the disaster known as ObamaCare," he said at a campaign rally in Melbourne, Fla. "It will be repealed and replaced."

"Just so you understand, our plan will be much better healthcare at a much lower cost," he added. "OK? Nothing to complain about."