A 2005 video of Donald Trump using lewd and sexually aggressive language in discussing women emerged today, further fuelling the narrative about the Republican presidential nominee's misogyny.

The video, obtained by the Washington Post and aired on US cable television, captures Mr Trump bragging about groping and trying to have sex with women, including someone who was married.

The three-minute video features Mr Trump discussing, in lewd terms, grabbing women with impunity.

"When you're a star they let you do it...You can do anything," he says.

The tape was shot as Mr Trump arrived on the set of a daytime soap opera, Days of Our Lives, for a taping of a segment in which he was to have a cameo, the Post said.

He was speaking with Billy Bush, a host of the Access Hollywood show about celebrities.

"I moved on her and I failed. I'll admit it," Mr Trump, a celebrity billionaire and real estate mogul, is heard saying in the video.

"I moved on her...but I couldn't get there. And she was married," Mr Trump says.

The tape was recorded in September 2005, months after Mr Trump married his third wife, Melania, according to the Post.

Mr Trump and Mr Bush are heard discussing Arianne Zucker, an actress who met them as they got off the bus.

"I've gotta use some Tic Tacs, just in case I start kissing her," Mr Trump says.

"You know I'm automatically attracted to beautiful… I just start kissing them," he adds.

The video, which emerged barely one month before the 8 November election date, led to a rare Trump apology.

"This was locker room banter, a private conversation that took place many years ago," Mr Trump said in a statement.

"Bill Clinton has said far worse to me on the golf course - not even close," he said, referring to the former president and wife of his Democratic presidential rival Hillary Clinton.

"I apologise if anyone was offended."

Mrs Clinton issued swift criticism of Mr Trump's comments.

"This is horrific. We cannot allow this man to become president," she posted on Twitter.

Mr Trump has criticised Bill Clinton for his past infidelity, and has suggested he would bring up the issue during his second debate with Mrs Clinton, on Sunday.