Clinton campaign dubs Donald Trump a porn star after he shames beauty queen

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The US presidential election just keeps getting weirder.

Donald Trump's latest Twitter rant has added fuel to the fire in his very public feud with former beauty queen Alicia Machado, causing the Clinton campaign to call Trump himself an adult movie star.

It began with Trump shaming Machado for what he termed a "disgusting" sexual past in a series of tweets posted at 3.20am in the US.

Then - in one of presidential history's more bizarre moments - he encouraged Americans to watch a "sex tape" he said would support his case, in a tweet posted at 5.30am.

The series of savage tweets referred to 1996 Miss Universe Alicia Machado, a Venezuela-born woman whose weight gain, he has said, created terrible problems for the pageant he formerly owned.

Unsurprisingly, Trump's pre-dawn Twitter tirade ricocheted across the campaign trail.

His campaign accused the media and rival Hillary Clinton of colluding to set him up for fresh condemnation, to which she retorted: "His latest Twitter meltdown is unhinged, even for him."

She also asked what kind of a man "stays up all night to smear a woman with lies and conspiracy theories?"

Alicia Machado PRESS RELEASE: "The Republican ...

Machado took to Facebook to say his tweets were part of a pattern of "demoralising women," calling them "cheap lies with bad intentions".

Machado has been in the campaign spotlight since Clinton noted on Monday in the first TV debate that Trump had mocked her publicly for gaining weight after she won Miss Universe.

Trump's Twitter taunts referred to footage from a Spanish reality show in 2005 in which Machado was a contestant and appeared on camera in bed with a male contestant.

Hilary Clinton (Matt Rourke/AP)
Clinton has criticised Trump's comments on Machado (Matt Rourke/AP)

The images are grainy and do not include nudity, though Machado later acknowledged in the Hispanic media that she was having sex in the video.

Then it emerged that the Republican presidential nominee featured in a cameo in an explicit 2000 Playboy video.

In a short clip posted on the website Buzzfeed, Trump pours a bottle of champagne on a Playboy-branded limo on a New York street, surrounded by a gaggle of women.

"There's been a lot of talk about sex tapes today and in a strange turn of events only one adult film has emerged today, and its star is Donald Trump," said Clinton spokesman Nick Merrill.