A New York appeals court has blasted Manhattan prosecutors for filling out Harvey Weinstein’s 2020 rape trial with what one judge called “incredibly prejudicial testimony” from women whose allegations were not part of the criminal charges against him.

The strategy has the potential to jeopardise the disgraced movie mogul’s conviction.

Members of a five-judge panel in the state’s intermediate appeals court appeared incensed with Judge James Burke’s decision to allow the witnesses, and for another ruling that cleared the way for prosecutors to confront Weinstein with evidence about other misbehaviour if he had testified.

Several judges on the panel appeared open to considering reversing Weinstein’s conviction and ordering a new trial.

A decision is not expected until January.

Judge Sallie Manzanet-Daniels was particularly vocal, saying prosecutors had piled on with “incredibly prejudicial” testimony from additional witnesses.

“Let’s inflame the jury’s heart by telling them that he beat up his brother during a meeting. I just don’t see how there is a balance there on that,” Manzanet-Daniels said, challenging a lawyer from the Manhattan district attorney’s office who implored the judges to uphold Weinstein’s conviction.

Weinstein, 69, was convicted in February 2020 of a criminal sex act for forcibly performing oral sex on a TV and film production assistant in 2006, and rape in the third degree for an attack on an aspiring actress in 2013.

He was acquitted of first-degree rape and two counts of predatory sexual assault stemming from actor Annabella Sciorra’s allegations of a mid-1990s incident.

The verdict was a landmark in the #MeToo movement that was spawned by women coming forward with allegations against Weinstein.

He maintains his innocence and contends that any sexual activity was consensual.

Burke, the Manhattan judge who presided over Weinstein’s trial, allowed prosecutors to bolster their case with testimony from three women who alleged Weinstein also violated them but whose claims did not lead to charges in the New York case.

Rules on calling witnesses to testify about so-called “prior bad acts” vary by state and were an issue in Bill Cosby’s successful appeal of his sexual assault conviction in Pennsylvania.

New York’s rules, shaped by a landmark decision in a 1901 poisoning case, are among the more restrictive.

Weinstein’s lawyers argued that extra testimony went beyond what’s normally allowed — detailing motive, opportunity, intent or a common scheme or plan — and essentially put the ex-studio boss on trial for crimes he was not charged with and had not had an opportunity to defend himself against.

Burke’s ruling allowing prosecutors to use horror stories from Weinstein’s past to attack his credibility worked to prevent him from taking the witness stand, Weinstein lawyer Barry Kamins told the appellate panel.

“The jury was overwhelmed by such prejudicial, bad evidence,” Kamins argued.

“This was a trial of Harvey Weinstein’s character. The people were making him out to be a bad person.”

Weinstein, sentenced to 23 years in state prison in New York, did not attend Wednesday’s arguments.

He was extradited to California earlier this year and is jailed there while awaiting trial on charges he assaulted five women in Los Angeles and Beverly Hills from 2004 to 2013.

– AAP