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 still needs to apologize for saying that President Obama wasn't born in the United States, Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE said Sunday.

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The 2016 Democratic presidential nominee called on the president-elect to apologize for his "birther" campaign against Obama.

"When Donald Trump helped lead the birther movement, that was nothing less than a racist effort to undermine the legitimacy of the first African-American president we have ever had," Sanders said on NBC's "Meet the Press.

"That was racist. That was disgraceful. The African-American community, and all of us, deserve an apology."