She did not deny claims she was concerned by Mr Trump's stance on Charlottesville, where a woman died in clashes with white supremacists, and Roy Moore, the controversial Alabama senate candidate.
"Yes, I will acknowledge numerous exchanges, particularly in the last six months, have been racially charged", Newman told ABC.
Conflicting reports surfaced Wednesday about whether Manigault Newman was sacked or had resigned.
Mr Trump sang her praises when he was asked at an unrelated White House event about the resignation.
Omarosa also trashed Ryan's reporting of her departure from the White House in the GMA interview, saying "I think we should take the word of the Secret Service over someone who has a personal vendetta to bring me down, and they personally gain by continuing to advance these false narratives". "I wish you continued success".More news: Devin Hester Announces his Retirement
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"There was a lack of diversity that I will acknowledge", she told the network for its program airing early Friday.
"It has been very, very challenging being the only African-American woman in the senior staff", Manigault Newman told ABC News' "Nightline" on Thursday.
Following her remarks, White House press secretary Sarah Sanders said that the White House had "a really diverse team across the board" and would "continue to grow the diversity". "I know he wants to continue those conversations as well to look at the best ways to do that and to do outreach to that community".
Whoopi Goldberg excoriated Omarosa on "The View" and pointedly said the fired White House official is "nasty" to women of color.
The White House announced that Manigault had resigned, which some sources disputed.
Trump was criticized for initially failing to condemn white supremacists and for doubling down three days later that there was "blame on both sides" and there were "some very fine people on both sides". Though the position is not Cabinet level, Surgeon General Jerome Adams, an African-American, has been serving since September. "Do we then just stop and label him as a racist? No". "Her departure will not be effective until January 20, 2018". And so yeah, I'm willing to bet that she's pissed off enough to start telling the dirtiest secrets that Donald Trump is hiding.