Donald Trump has slammed six former “Apprentice” contestants as “failing wannabes” after the group held a news conference in New York on Friday to denounce their former boss’ presidential campaign.

The group led by Randal Pinkett, winner of the NBC reality show’s second season, urged voters to dump Trump, asserting that his platform was rooted in “sexism, xenophobia, racism, violence and hate,” in Pinkett’s words. The news conference came in advance of New York’s April 19 primary, where native son Trump is expected to win the Republican vote by a wide margin.

Trump shot back in a statement that Pinkett “did a terrible job” when he worked for the Trump Organization after prevailing on the show in 2005.

The other participants in the Manhattan news press conference were Kevin Allen, Tara Dowdell, Marshawn Evans Daniels, James Sun and season one runner-up Kwame Jackson. Dowdell warned that Trump’s rhetoric has the effect of “validating hate and bigotry in a way that has the potential to tear this country apart.”

Trump accused the group of seeking “the limelight like they had when they were with Trump” and threatened to release “hours of footage of them individually praising me.”

Other “Apprentice” contestants have voiced support for Trump’s campaign, notably season one breakout personality Omarosa Manigault-Stallworth and Andy Litinsky, who went on to run Trump’s TV production company after his appearance in season two.