Several women have given interviews in which they make allegations of sexual assault against Donald Trump.
His campaign has dismissed the allegations as having no merit or veracity. But the allegations come just days after damaging revelations about Trump - a recording from 2005 was published where he made a series of vulgar and sexually predatory comments about women.
In a letter from his lawyers, Trump demanded one of the media outlets which published the women's accounts - the New York Times - retract what it called a "libellous article" and apologise.
"For The New York Times to launch a completely false, co-ordinated character assassination against Trump on a topic like this is dangerous," said Jason Miller, Trump's campaign spokesman.
"To reach back decades in an attempt to smear Trump trivialises sexual assault, and it sets a new low for where the media is willing to go in its efforts to determine this election."
One woman who has made allegations against Trump is Jessica Leeds, 74, of New York. She told the New York Times: "He was like an octopus".
She encountered Trump on an airline flight three decades ago and said he grabbed her breasts and tried to put his hand up her skirt.
"His hands were everywhere", she said.
Meanwhile, Rachel Crooks, from Ohio, said she met Trump at Trump Tower in 2005, when she was 22 years old. She claimed he kissed her "directly on the mouth" against her will.
Trump denied the accusations, saying: "None of this ever took place."
The letter from his lawyers said unless the paper removed the article from its website and ceased further publication, it would pursue "all available actions and remedies".
In Florida, the Palm Beach Post reported that Mindy McGillivray, 36, told the newspaper Trump groped her at his Mar-a-Lago estate 13 years ago.
People magazine reporter Natasha Stoynoff also posted a story about a 2005 incident at Mar-a-Lago. She wrote, he "was pushing me against the wall, and forcing his tongue down my throat".
The Trump campaign said there was no "merit or veracity" to either story.
Hillary Clinton's communication's director, Jennifer Palmieri, said in a statement that the latest run of allegations "sadly fits everything we know about the way Donald Trump has treated women".