Donald Trump has called a former senior adviser a "dog" who is a "crazed, crying lowlife" after she released a tape in which the president expressed surprise at learning of her dismissal.
Omarosa Manigault Newman said she made the recording when Mr Trump called her the day after she was taken into the high-security Situation Room and fired by White House chief of staff John Kelly last year.
In the tape, played on NBC's Today programme on Monday, Mr Trump said "nobody even told me" about her leaving, to which she replies: "Wow."
He then adds: "You know they run a big operation, but I didn't know it.
"I didn't know that. Goddamn it. I don't love you leaving at all."
When you give a crazed, crying lowlife a break, and give her a job at the White House, I guess it just didnt work out. Good work by General Kelly for quickly firing that dog!
— Donald J. Trump (@realDonaldTrump) August 14, 2018
The president used the recording to attack his former employee straight after the broadcast on Monday and then again on Tuesday.
His latest tweet about Ms Manigault Newman said: "When you give a crazed, crying lowlife a break, and give her a job at the White House, I guess it just didn't work out.
"Good work by General Kelly for quickly firing that dog!"
Ms Manigault Newman is a former contestant on The Apprentice, which Mr Trump judged, and was given a job in the White House by the Trump administration after his election.
She later became the president's senior adviser.
Wacky Omarosa, who got fired 3 times on the Apprentice, now got fired for the last time. She never made it, never will. She begged me for a job, tears in her eyes, I said Ok. People in the White House hated her. She was vicious, but not smart. I would rarely see her but heard….
— Donald J. Trump (@realDonaldTrump) August 13, 2018
…really bad things. Nasty to people & would constantly miss meetings & work. When Gen. Kelly came on board he told me she was a loser & nothing but problems. I told him to try working it out, if possible, because she only said GREAT things about me – until she got fired!
— Donald J. Trump (@realDonaldTrump) August 13, 2018
Ms Manigault Newman has come under heavy criticism for revealing she made the recording in the White House's Situation Room, where top-level security decisions are made by the president and where phones and recording devices are banned.
Mr Trump's Twitter attack on Ms Manigault Newman comes a day after he initially responded with three tweets calling her "wacky", "vicious but not smart" and said "people in the White House hated her".
Ms Manigault Newman told NBC it was "sad, with all the things going on in the country" that the president "would take time out to insult me and my intelligence".
She added: "This is his pattern with African-Americans.
"He doesn't know how to control himself."
While I know its “not presidential” to take on a lowlife like Omarosa, and while I would rather not be doing so, this is a modern day form of communication and I know the Fake News Media will be working overtime to make even Wacky Omarosa look legitimate as possible. Sorry!
— Donald J. Trump (@realDonaldTrump) August 13, 2018
Mr Trump also denied saying the N-word "multiple times" while filming The Apprentice with Ms Manigault Newman, which she claimed were in reference to Kwame Jackson, an African-American contestant on the show.
And she accused Mr Trump of lying to the American people, saying he "doesn't even know what's happening in his White House".
More from Donald Trump
In her book, Unhinged: An Insider's Account of the Trump White House, she said she had not signed a non-disclosure agreement.
On Monday Mr Trump claimed that she had.
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