Story highlights President Barack Obama said he didn't think Republican presidential front-runner Donald Trump would ever become U.S. President

"Interesting how President Obama so haltingly said I 'would never be president' - This from perhaps the worst president in U.S. History," Trump tweeted Wednesday morning

Washington (CNN) Donald Trump attacked President Barack Obama on Wednesday calling him "the worst president in U.S. history" after the President sharply criticized the Republican front-runner.

"Interesting how President Obama so haltingly said I 'would never be president' - This from perhaps the worst president in U.S. history," Trump tweeted

Obama dismissed the possibility of Trump being president Tuesday saying the American people are too "sensible" to elect him.

"I continue to believe Mr. Trump will not be president," Obama said at a news conference in California after a meeting with southeast Asian leaders. "And the reason is that I have a lot of faith in the American people. Being president is a serious job. It's not hosting a talk show, or a reality show."

Obama criticized Trump's foreign policy knowledge and the businessman's approach to campaigning.

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