It's one of the greatest political fallouts ever. Period.

Key points: The former White House communications director is fundraising against his former boss

The former White House communications director is fundraising against his former boss Mr Scaramucci accused Donald Trump of "tearing at the racial and social fabric" of the United States

Mr Scaramucci accused Donald Trump of "tearing at the racial and social fabric" of the United States Mr Trump has previously labelled him an "unstable nut job" and incompetent

Anthony Scaramucci served for just 11 days as White House communications director before being sacked for his derogatory comments about some of Donald Trump's inner circle.

Now 'The Mooch' is fundraising against his former boss, who he wants to make a one-term president.

He told the ABC the most powerful man in the world was an "orange fat blob" with the "self-esteem of a pigeon" and warned Australia it would be difficult to maintain its current close relationship with the White House.

He said the President's insistence Hurricane Dorian was heading for Alabama (despite the words of his own scientists) was proof of a frail ego.

"Again, it's his inability to ever be wrong about anything or ever to apologise for anything, It basically has to do with very low self-esteem," he said.

"I mean the poor guy has the self-esteem of a small pigeon."

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Mr Scaramucci says he is worried about the global standing of the US after the President's announcement he had cancelled secret peace talks with the Taliban at Camp David.

"I think there's a lot of people in the United States who are upset that he's negotiating with the Taliban at Camp David because of their involvement and being accessories to the 9/11 disaster," Mr Scaramucci said.

"I'm not one of them, even though there were 40 people from my hometown and two close friends, one of whom I eulogised [who died]. I'm not one of them.

"I've been to Afghanistan. But what I find disgusting about the President is the way he releases this information, and the way he has lost all global credibility."

Trump 'intimidated' by 'good-looking' Trudeau

Unlike other world leaders, Australia's Prime Minister Scott Morrison has enjoyed remarkable access to the White House, which is hosting just its second state dinner in his honour.

In a city that is becoming famous for political dramas and fallouts, maintaining that relationship won't be easy, according to Mr Scaramucci.

"I would tell him [Mr Morrison] to follow the Justin Trudeau model. President Trump is very intimidated by Justin Trudeau because he's a good looking, smart kid and President Trump is like this orange fat blob," he said.

"And so he's very intimidated by the way the guy looks. And Justin Trudeau has been very, very smart at keeping his distance from President Trump.

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"Remember, he's such a malignant narcissist that he needs the spotlight at all times."

With some signs of trouble ahead for the global economy, and even considering Australia's record run without a recession, Mr Scaramucci said there was reason to be concerned by the ongoing trade war with China.

"He completely botched the trade war, we went to him early on. Remember, I was on the transition team," he said.

"We told him [to] graduate the tariffs. If you want to use the tariffs, graduate them. Go 2 per cent a quarter and then you'll give every business leader in the country large and small opportunity to adjust their supply chain.

"And so for me and business leaders, that's been very disruptive.

"If you look at capital spending in the US, it's down considerably in the last couple of quarters, and it's likely to be down in the third quarter and this is all a result of the Trump nonsense."

The White House did not respond to requests for comment, but in the past has made it clear the ill-feeling is mutual.

Mr Trump has called Mr Scaramucci an "unstable nut job" whose 11 days as director of communications were marked by gross incompetence.

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Watch Duration: 1 minute 54 seconds 1 m 54 s Press secretary Sarah Huckabee Sanders said Mr Trump believed Mr Scaramucci's comments were "inappropriate".

Mr Scaramucci said he turned on his former boss because as a businessman he is constantly evaluating scenarios and would rather be called a traitor then support what he sees as racism.

In his case, it was the President telling four congresswomen of colour to go back where they came from.

"He is tearing at the racial and social fabric of society and so whatever good is happening on the policy side, and many of those business policies I agree with, you're tearing and you're ripping apart the social fabric of the society," he said.

"The United States can survive a recession. Australia, apparently you guys don't have them anymore.

Mr Scaramucci said he was worried about the global standing of the US. ( News Video )

"But we've had 12 of them since 1901 and we've survived everyone of them.

"That's sort of like a bone break, but a tearing or a destroying of the fabric of the American experiment, that's a metastatic cancer."