A former model has accused Donald Trump of groping her after the two were introduced by sexual abuser Jeffrey Epstein in the 1990s, The Guardian newspaper reported on Wednesday.

Stacey Williams said she met the Republican White House candidate at a party in 1992 after being introduced by the disgraced financier, whom she had dated.

"It became very clear then that he and Donald were really, really good friends and spent a lot of time together," Williams was quoted as saying.

Williams discussed the alleged assault on a call on Monday organized by Survivors for Kamala, a lobby group supporting Trump's Democratic presidential rival Kamala Harris.

Epstein, who was convicted on sex offenses and killed himself in prison in 2019, paid Trump an impromptu visit with Williams in 1992 at his New York office block, where he pulled her toward him and began groping her, she alleged.

Williams, now 56, says Trump put his hands "all over" her breasts, waist and buttocks, causing her to freeze on the spot, and she noticed that the two men appeared to be smiling at each other.

The Trump campaign did not immediately respond to AFP's request for comment, but The Guardian quoted a campaign spokeswoman dismissing the allegations as a "fake" story.

She said it was invented by the Harris campaign and described Williams "a former activist" for Democratic ex-president Barack Obama.

Williams shared a postcard depicting Trump's south Florida mansion she said he had sent her agent after the episode, with the message, in his handwriting: "Stacey – Your home away from home. Love Donald."

About two dozen women have accused the former president, who has been convicted of multiple felonies, of sexual misconduct dating back decades. The allegations have included claims of Trump kissing them without their consent, reaching under their skirts, and, in the case of some beauty pageant contestants, walking in on them in the changing room.

He was ordered by a New York court in January to pay $83.3 million to compensate the writer E. Jean Carroll, whom he was found liable for sexually assaulting and defaming.