The Virginia Republican party has demanded an explanation from Northam and snarkily tweeted that it was "not surprised" Northam hadn't tweeted about the first day of Black History Month today.
State Sen. Louise Lucas, a close ally of Northam and longtime African-American lawmaker, said black leaders felt "mortally wounded" by the photo and that he has no option but to resign. Even Planned Parenthood called on Northam to resign.
Former Democratic governor L Douglas Wilder said Mr Northam should be criticised for the photos, but stopped short of calling for his resignation.
New York Times reporter Jonathan Martin is also reporting that Northam is calling Virginia Democrats, telling them that he is not the man in the photo.
"I am asking for the opportunity to earn your forgiveness", Northam said, standing alongside his wife. It is because my memory of that episode is so vivid that I truly do not believe I am in the picture in my yearbook.
His refusal to resign signals a potential bruising fight between Northam and his former supporters.
Calls for resignation came loud and clear from a number of 2020 presidential candidates, who said Northam's apology was insufficient. Sen.
Virginia Governor Ralph Northam faced the public today and defiantly said he will not resign because he does not believe that it is him in a racist photograph from his 1984 medical school yearbook.
"He should resign", he tweeted Friday.
But he said that on reflection with his family and friends he had concluded that he was not either of the people in the photo.
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The head of Northam's party in the state also called on him to quit. "Governor Northam must end this chapter immediately, step down, and let Lt. Gov. Justin Fairfax heal Virginia's wounds and move us forward".
"While his career has been marked by service to children, soldiers, and constituents, I can not condone the actions from his past that, at the very least, suggest a comfort with Virginia's darker history of white supremacy, racial stereotyping, and intimidation", Fairfax said of the governor.
A photo of Virginia Gov. Ralph Northam that surfaced Friday has folks in the Commonwealth State, and those around the country, wondering if he'll resign.
Fairfax released his statement after Northam's press conference this afternoon.
"Ralph Northam has had three decades to know better but only now does he acknowledge this racist act", the Congressional Black Caucus posted on Twitter.
"I am far from ideal and I can always strive to do more", he said.
Northam's page in the 1984 yearbook from Eastern Virginia Medical School shows a picture of a person in blackface and another wearing a Ku Klux Klan hood.
"Yesterday I took responsibility for content that appeared on my page in the Eastern Virginia Medical School yearbook that was clearly racist and offensive", said Northam.
"The Governor must now listen to the people and communities he has hurt, and carefully consider what comes next", Warner said in a statement provided to NBC News.
Tran said she and her family have received death threats through telephone messages, email and social media, leading to extra police protection for her and her family and hard discussions with her young children.