CNN host Anderson Cooper and Sen. Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.) clashed Wednesday over whether one of President-elect Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE’s key appointments is a white supremacist.

Warren ignited the encounter by accusing Stephen Bannon, Trump’s incoming chief strategist and senior counselor, of practicing the racist ideology.

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“[Trump’s] got as his strategic adviser someone who’s a white supremacist,” she said of Bannon, the former chairman of Breitbart News, on CNN’s “Anderson Cooper 360.”

“Wait a minute, there’s no evidence he’s a white supremacist,” Cooper said, interrupting Warren. "Obviously, there are people who are white supremacists who support Donald Trump and support Breitbart or Steve Bannon.”

Warren audibly exhaled at Cooper’s remarks before defending her criticism of Bannon, who was also Trump’s presidential campaign CEO.

“Steve Bannon has certainly associated himself with white supremacists,” said Warren. "Will you go that far?”

“I don’t know that you can say, though, that he’s a white supremacist,” Cooper retorted.

“This is a guy whose appointment is applauded by the [Ku Klux Klan],” Warren added of Bannon. "He’s associated himself with white supremacists, is that close enough?

“What Donald Trump is doing, so far, is that he’s said he’s going to go forward on bigotry and he’s going to go forward on Wall Street insiders. I think this is a real problem for the American people.”

Trump announced Bannon’s future role earlier this month, sparking outcry from critics who object to his links to Breitbart.

Bannon has described the news website as a platform for the “alt-right,” a far-right group that often overlaps with racism, white nationalism and populism.

Trump defended Bannon last week, vowing he “wouldn’t even think” about hiring someone who is bigoted.