"Lowlife, she's a lowlife", Trump responded before exiting a platform where he had been asking the bikers for their thoughts on the media.
She said: 'I was told exactly what Donald Trump said - yes, the N-word and others in a classic Trump-goes-nuclear rant - and when he's said them.
"She's a lowlife", Trump said, before stepping back into the crowd.
White House press secretary Sarah Sanders said: 'This book is riddled with lies and false accusations.
Manigault Newman also claims Trump repeatedly uses the racially offensive N-word, including on an occasion when he was taped, and has threatened to reveal the names of illegitimate children he has allegedly fathered.
Reports of the bombshell allegations in the book against Trump caught fire this week, including her calling him a "racist", "misogynist", and a "bigot" alongside accounts of him using a racial slur on the set of The Apprentice, and eating a piece of paper in the Oval Office.
Arsenal v Man. City: Emery sets sight on Pep's squad
He'll be among the players Arsenal will have to keep a close eye on if they're to stand any chance of getting a result. Sergio Aguero hit the ground running with a brace in the Community Shield win and will lead the line against Arsenal .
Best meteor shower of 2018 visible over Middle TN this weekend
If you're on the West Coast, be aware that, as AccuWeather points out , the wildfires may make the meteors harder to see. As they burn, they create a bright burst of light across the sky - traveling at about 37 miles-per-second.
Mourinho frustrated as Premier League clubs race to beat new deadline
They've never won six in a row against promoted clubs previously in the competition. He added: "I don't think there's a lot of changes (to the squad from last season)".
In this photo, taken February 14, 2017, Omarosa Manigault-Newman, then an aide to President Donald Trump, watches during a meeting with parents and teachers in the Roosevelt Room of the White House in Washington.
President Donald Trump called Omarosa a "lowlife" in his first public response to her new tell-all book. She acknowledges she had never been able to obtain or hear the tapes but said three unnamed sources had described their contents.
At one point, he was asked about former White House adviser and reality star Newman. She says she had seen him acting inappropriately at numerous events he attended without his wife at his Mar-a-Lago estate in Florida, including birthday parties, fundraisers and golf tournaments.
She also writes that Trump is showing signs of "mental decline that could not be denied".
"It's sad that a disgruntled former White House employee is trying to profit off these false attacks", she said.