Hillary Clinton has mocked Donald Trump's furious early-morning Twitter tirade with a tweet storm of her own.

Exactly 24 hours after Trump's bizarre pre-dawn comments blasting a "disgusting, con" beauty queen and "crooked Hillary," the Democratic nominee embarked on her own tweet frenzy - though the tone was vastly different.

"It's 3:20am. As good a time as any to tweet about national service," read the first message.

In the next, Clinton borrowed one of Trump's favourite words.


"There are hundreds of thousands more @AmeriCorps applications than spots. Horrible!" it read. "Let's expand it from 75,000 annual members to 250,000."

Trump had again caused a stir on Friday with his controversial social media comments, which encouraged voters to check out a "sex tape" featuring former beauty queen Alicia Machado with whom he's feuding, and suggesting Clinton helped her secure US citizenship.

Machado is a Venezuela-born woman whose weight gain Trump has said created terrible problems for the pageant he owned at the time.

Clinton cited Trump's treatment of Machado near the end of their first debate, and Trump has spent days revisiting his complaints about Machado.

"Did Crooked Hillary help disgusting (check out sex tape and past) Alicia M become a U.S. citizen so she could use her in the debate?" read a tweet Trump posted at 5:30am, one in a series of attacks on her.

Clinton's camp was quick to hit back, pointing out Trump's own adult film history.

"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, adding he hadn't seen the film.

Meanwhile, Trump's campaign accused the media and Clinton of colluding to set him up for fresh condemnation, to which Clinton retorted, "His latest twitter meltdown is unhinged, even for him."

With AP