Trump was firing back at President Obama after the president said he has “faith” the American people won’t elect Trump.

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“You’re lucky I didn’t run last time when Romney ran because you would have been a one-term president,” Trump told supporters in Beaufort, S.C.

Just an hour earlier, Obama expressed doubt that Trump could succeed him in the Oval Office, saying it's too "serious" a position for the showman to hold.

“I continue to believe Mr. Trump will not be president, and the reason is because I have a lot of faith in the American people, and I think they recognize that being president is a serious job," Obama said.

"It's not hosting a talk show or a reality show, it's not promotion, it's not marketing. It's hard. And a lot of people count on us getting it right, and it's not a matter of pandering and doing whatever gets you in the news on a given day."

Trump responded by blasting Obama’s record in office, saying he’s done a “lousy” job on spending, national defense, healthcare and immigration.

“You look at our budgets, our spending, we can’t beat ISIS, ObamaCare is terrible — we’re going to terminate it — absolutely terminate and replace it,” Trump said.

“You look at everything. Our borders are like Swiss cheese. This man has done such a horrible job, he’s set us back so far. For him to say that is actually a great compliment, if you want to know the truth.”