Sen. Bernie SandersBernie Sanders2020 Democrats join striking McDonald's workers Billionaire's M gift to Morehouse grads points way to student debt solution Poll: Nearly half of Clinton's former supporters back Biden 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 TrumpNASA exec leading moon mission quits weeks after appointment The Hill's Morning Report — After contentious week, Trump heads for Japan Frustration boils over with Senate's 'legislative graveyard' 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 ClintonFrustration boils over with Senate's 'legislative graveyard' Poll: Nearly half of Clinton's former supporters back Biden Harris readies a Phase 2 as she seeks to rejuvenate campaign MORE, and to keep focusing, keep focusing on the real issues facing the American people."

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