Donald Trump is intimidated by Canadian Prime Minister Justin Trudeau's boyish good looks, according to former White House aide Anthony Scaramucci, who calls his former boss an 'orange fat blob' by comparison.

The famously caustic investor who lasted just 11 days as White House communications director told Australia's ABC television network that Trump is a 'malignant narcissist' who 'needs the spotlight at all times.'

Trudeau, 47, has parlayed a telegenic movie-star image and deft political softness into a quiet, steady global image – the polar opposite of Trump's bombast.

Scaramucci, now on a one-man crusade to stop the U.S. president from winning four more years in office, is taking a page from Trump's playbook to undermine the 73-year-old billionaire leader.

He told an Australian reporter that the down-under prime minister Scott Morrison should study Trudeau's success at winning unusually consistent White House access to the Oval Office, staying out of the headlines when he has an audience in the Oval Office.

Trudeau (left) and Morrison (top Right), pictured at the August G7 meeting in France, are quietly gaining influence as they cede the media attention to the spotlight-seeking U.S. president

Red hot: 'President Trump is very intimidated by Justin Trudeau because he's a good looking, smart kid,' said Anthony Scaramucci (Trudeau and Trump with First Lady Melania Trump at the G7 Summit last month)

'I would tell him to follow the Justin Trudeau model,' Scaramucci said.

'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.'

'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,' he added.

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

Trump has called Scaramucci an 'unstable nut job' who was too incompetent to last even two weeks in government service.

Scaramucci has predicted that Trump will withdraw from the Republican nomination, and delivered a string of insults.

'The Mooch,' as he is known in media circles, has called the president a malignant racist who is unfit to run the U.S. even in the midst of an economic boom, as well as describing him as being in mental decline, 'off the rails,' and described his rhetoric as a 'word salad.'

Speaking to ABC Australia, he said: '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.'

In an interview with an Australian news outlet, 'The Mooch' advises Australia's prime minister , Scott Morrison to keep a low profile around Trump if he wants to be effective

Scaramucci lasted 11 days as Trump's communications director before washing out in an F-bomb laden news interview that became a firing offense

Scaramucci compared the threat of a Democrat-led recession to a 'bone break' from which the nation can eventually recover.

'We've had 12 of them since 1901 and we've survived everyone of them,' he insisted.

But Trump, he argued, has introduced 'a metastatic cancer' into America's framework by pitting Americans against each other and inflaming racial tensions – something the White House insists is the result of a 'fake news' media establishment that's stacked against the president.

Scaramucci also said that things would be going far better if President Trump had stuck to the economic model that he devised for the administration shortly after the election and not 'botched the trade war' with his 'nonsense' plan.

'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,' said Scaramucci.

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

Scaramucci is raising money for Democrats but it's unclear how much he can move the needle in the few swing states that will decide the presidential election.

His centers of influence, New York and California, are 'irrelevant echo chambers,' a Republican strategist said Monday.

'Anthony is competing with the president in loudness and press attention,' the strategist said, 'but one of them is president and the other one is trying to extend his 15 minutes of fame.'

Scaramucci has been evangalizing against Trump so strenuously that he is cozying up to Democrats who want to bounce the president from power; he's pictured in this tweet with Democratic primary candidate Andrew Yang

Scaramucci had sharp praise for Trump in a 2018 book about his 'blue collar' presidency.

'It was only when Anthony joined the Donald Trump for President campaign as a surrogate and economic advisor that his eyes were opened to the plight of our country's middle class,' his publisher wrote in a publicity blurb.

'It took a billionaire real estate developer who lived in a tower on Fifth Ave to show him what had happened to the neighborhood in which he'd grown up and communities like it throughout America. It was then that Anthony realized that Donald Trump and his economic policies were the best bet for our country's future.'