People magazine published an article on Tuesday that quoted six people who claimed to corroborate the sexual assault allegation made against Donald J. Trump by the magazine writer Natasha Stoynoff, which both Mr. Trump and his wife, Melania, have angrily denied.
Ms. Stoynoff accused Mr. Trump of cornering her alone in 2005 and “pushing me against the wall and forcing his tongue down my throat” while she was at his Florida residence to interview him and his wife for an article on their first wedding anniversary.
People published her claims on the same day that The New York Times published an article in which two women described what they said were their own encounters with a sexually aggressive Mr. Trump.
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The six people quoted in the latest article include two editors from People, Mary Green and Liz McNeil; a professor of journalism, Paul McLaughlin; a co-worker; and two personal friends of Ms. Stoynoff. All of them said Ms. Stoynoff told them about the episode around the time it occurred.
“She wasn’t sure what she should do,” Mr. McLaughlin told the magazine. “I advised her not to say anything, because I believed Trump would deny it and try to destroy her.”
Indeed, Mr. Trump has denied Ms. Stoynoff’s accusations and used the bully pulpit of his rallies to call her “a liar” and unattractive, telling one crowd, “Look at her, I don’t think so.”
Ms. Trump also rejected the writer’s accusations. She called the claims by Ms. Stoynoff and other women “lies” in an interview with CNN on Tuesday. Last week, Ms. Trump threatened to sue People over an anecdote in Ms. Stoynoff’s article that recounted a friendly encounter between the two women on a Manhattan street.
One of the people quoted in the magazine story, Liza Herz, backed Ms. Stoynoff’s version of events. She said she was a witness to the sidewalk meeting that the candidate’s wife contends never took place.
“They chatted in a friendly way,” Ms. Herz said. “And what struck me most was that Melania was carrying a child and wearing heels.”
Ms. Stoynoff said she knew Mr. Trump for several years before the interview during which she claimed he attacked her. She covered his NBC reality show, “The Apprentice,” for People, had previously met him at his home in Trump Tower, and attended his wedding to Ms. Trump.
She said Mr. Trump attacked her during a 2005 interview at his Mar-a-Lago estate in Palm Beach, Fla., pinning her against a wall and kissing her. Ms. Stoynoff said the butler walked into the room during the attack and led her and Mr. Trump to an outdoor patio where they were supposed to meet Ms. Trump to resume an interview.
Ms. Stoynoff said Mr. Trump leaned forward while they waited for his wife and informed her they would soon begin a sexual relationship.
“You know we’re going to have an affair, don’t you?” he said, according to Ms. Stoynoff’s account. “Have you ever been to Peter Luger’s for steaks? I’ll take you. We’re going to have an affair, I’m telling you.”
She said he also referenced a well-known article published in The New York Post in the early 1990s while he was cheating on his first wife, Ivana Trump, with the woman who would become his second, Marla Maples. “You remember,” he said. “ ‘Best Sex I Ever Had.’ ”
Marina Grasic, a longtime friend of Ms. Stoynoff, told People that the writer called her the next day and described both the attack and Mr. Trump’s proposition.
“Beyond just the attack, she was horrified by the vulgar circumstances under which she was attacked and propositioned to have an affair,” Ms. Grasic said. “She was there in a professional capacity, writing an article about their happy marriage, and after the incident Trump acted like nothing happened.”
“She was particularly concerned that if he was capable of such behavior, what else was he capable of?” Ms. Grasic added.