Donald Trump's lead in national and New Hampshire polls does not mean his ideas should be treated seriously, Trump rival Marco Rubio, R-Fla., says.

Rubio spoke Saturday afternoon at Furman University in Greenville, S.C., a few hours northwest of Aiken, S.C., where Trump addressed backers earlier Saturday.

Rubio, widely seen as the front-runner among establishment Republicans eager to topple Trump, took aim at the real estate developers controversial call to ban Muslims from immigrating to the United States.

"I just don't see it as a serious proposal," Rubio said. "Obviously, I think he did it largely to get back in the news."

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