Sen. Bernie SandersBernie SandersPoll: Bloomberg stalls after Vegas debate Prominent Texas Latina endorses Warren Bloomberg campaign: Vandalism at Tennessee office 'echoes language from the Sanders campaign and its supporters' MORE (I-Vt.) on Sunday called leaked Democratic National Committee (DNC) emails “outrageous.”

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"First of all, I am not an atheist," Sanders said on CNN’s “State of the Union.”

The emails showed top party officials tried to undermine Sanders’s presidential campaign. In one, an official suggests sending a surrogate to ask an unnamed candidate whether that candidate believed in God.

DNC Chief Financial Officer Brad Marshall’s email does not name the Vermont senator, but it talks about a man of “Jewish heritage” Marshall believes to be an atheist.

"I mean, it is an outrage and sad that you would have people in important positions in the DNC trying to undermine my campaign," Sanders said on Sunday. "It goes without saying the function of the DNC is to represent all of the candidates, to be fair and even-minded."

Sanders said on CNN that the emails were “outrageous” but added they did not come as a “great shock” to him. 

"I think the focus, though, that I am going to go forward on right now is to make sure that Donald TrumpDonald John TrumpComey responds to Trump with Mariah Carey gif: 'Why are you so obsessed with me?' Congress to get election security briefing next month amid Intel drama New York man accused of making death threats against Schumer, Schiff MORE, perhaps the worst Republican candidate in the modern history of this country, somebody by temperament, somebody by ideology must not become president of the United States. I'm going to do everything I can to defeat him, to elect Hillary ClintonHillary Diane Rodham ClintonComey responds to Trump with Mariah Carey gif: 'Why are you so obsessed with me?' Trump dismisses reports of Russian meddling, labels them Democratic 'misinformation campaign' The new American center MORE, and to keep focusing, keep focusing on the real issues facing the American people."

--This report was updated at 10:29 a.m.