Actor Robert De Niro has shouted “Shame on you!” as he testified in a New York courtroom, directing the comments toward his former executive assistant and vice president who is seeking millions of dollars after accusing her former boss of being abusive.

Graham Chase Robinson watched with her lawyers on Tuesday while De Niro’s anger built as lawyer Andrew Macurdy pelted him with some tabloid-style accusations his client made about De Niro’s behaviour toward Robinson as she served his needs, large and small, from 2008 until several months into 2019.

Robinson, 41, seeks $US12 million ($19 million) in damages for emotional distress and reputational harm that she claims has left her jobless and unable to recover from the trauma of her job.

She was being paid $US300,000 ($473,000) annually when she quit, frustrated by her interactions with De Niro’s girlfriend and the effect she believed it was having on the actor.

The jury is also considering evidence pertaining to a lawsuit De Niro filed against Robinson in which he claimed that she stole things from him, including five million points that could be used for airline flights. De Niro is seeking the return of three years of Robinson’s salary.

Macurdy asked De Niro whether it was true that he sometimes urinated as he spoke with Robinson on the telephone.

“That’s nonsense,” De Niro answered. “You got us all here for this?”

Macurdy told De Niro he called Robinson “bitch to her face.”

“I was never abusive, ever,” the actor snapped back, though he conceded that he might have used the word in conversations with her.

And the claim that he told Robinson he preferred that she scratch his back rather than using a back scratching device drew another angry rebuke from De Niro, who said it might have happened once or twice, but “never was with disrespect or lewdness.”

Finally, he angrily looked toward Robinson and shouted: “Shame on you, Chase Robinson!”

Quickly, he blurted an apology in a quieter voice, as he glanced toward Judge Lewis J. Liman.

De Niro, 80, has won two Oscars in a six-decade movie career that has featured memorable roles in films including The Deer Hunter and Raging Bull. He is currently starring in Martin Scorsese’s Killers Of The Flower Moon.

– AAP