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Durham, N.H. -- Hillary Clinton is calling on Donald Trump to apologize for not correcting a questioner who falsely claimed President Obama is a Muslim, adding that Trump and all 2016 candidates "should start behaving like a president."

A man at Trump’s event in Rochester, New Hampshire, asked the Republican presidential frontrunner how the U.S. can “get rid” of Muslims and asserted that Obama was a Muslim who was not born in this country.

“I was appalled,” Clinton told reporters here. “He should have from the beginning repudiated that kind of rhetoric, that level of hatefulness in a questioner in an audience that he was appearing before.”

Clinton said Trump should go on national television and apologize, which Sen. Lindsey Graham suggested to NBC’s Andrea Mitchell today on “Andrea Mitchell Reports.”

Donald Trump not denouncing false statements about POTUS & hateful rhetoric about Muslims is disturbing, & just plain wrong. Cut it out. -H — Hillary Clinton (@HillaryClinton) September 18, 2015

“Let’s see what he does. I think that his taking a time out to think hard about what happened last night, what he did not call out or repudiate at the time, gives him the chance to express his regret about that kind of behavior and those sorts of comments in one of his political events,” Clinton said.

The Democrat said all White House hopefuls need to “start behaving like a president, to show respect and to stand up for the truth.”

She said the man likely would not have attended one of her rallies, but if he did she “would have called him out on it.”