Sen. Bernie SandersBernard (Bernie) SandersAvenatti on 2020 campaign: 'The truth is my policy issue' Democrats embracing socialism is dangerous for America Pressley seeks Ocasio-Cortez-styled win in Boston 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 TrumpMattis defends reversing his stance on Trump's 'Space Force' Pelosi: Trump engages in racism 'constantly' Tom Steyer: Pelosi is wrong about Trump impeachment push 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 ClintonGiuliani: Mueller told us he'd wrap up Trump obstruction probe by Sept. 1 McAuliffe: We should look at impeaching Trump over Putin summit Graham: DOJ official was 'unethical' in investigating Trump campaign because his wife worked for Fusion GPS MORE, and to keep focusing, keep focusing on the real issues facing the American people."

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