Malcolm Turnbull's Son Unleashes On Twitter: 'Wake Up'

Alex Turnbull isn't holding back on Twitter.

Shortly after his father announced his intention to resign from Australian political life, Malcolm Turnbull's son Alex Turnbull announced that he'd be at last speaking his mind.

"Hi everyone," he tweeted, to perhaps a thousand Twitter followers. "I'll be saying what I think a bit more often from now on."

Since that moment, the younger Turnbull -- a 36-year-old fund manager based in Singapore -- has been tweeting freely. His follower count has exploded to well over 10,000, with people keen to hear his thoughts on climate change, the Coalition government, the powers behind the scenes, Donald Trump, and, somewhat unexpectedly, Labor.

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He hasn't held back, either, describing conservative think-tanks as "racist", questioning powerful mining lobby groups, and retweeting both Labor politicians and journalists critical of the machinations behind the leadership crisis.

But perhaps the most surprising tweet from the new, open Alex Turnbull was the very public endorsement of Tim Murray, the Labor candidate running in his dad's old seat of Wentworth.

"Best bang for the buck you'll get in political donations in your life," he said.

"Tight race, tight margin for government, big incremental effect whatever happens.

"If you want a federal election now this is the means by which to achieve it."

"Times like this you have to decide what your first loyalty is: party or country?" he later tweeted in response to criticism.

"I'm going with country. We need donations reform, federal ICAC and sane energy policy NOW."

To another critic, he said:

"If you want blind unthinking faith you can go to a place of worship. If all you are is barracking for a football team in politics you're just a useful idiot footsoldier for the vested interests that run the place. Wake up."

When Malcolm Turnbull was cornered in New York York city and asked about his son's public backing of a Labor candidate, the former PM replied that he was a grown adult.

"My son's 36, and he's entitled to his own political opinions," he said.

He said that the families of politicians, and in particular the Prime Minister, were under considerable constraint on what they could say publicly.

"Now he's no longer the son of the Prime Minister, he is able to express his views on all sorts of issues in a way that he hasn't been before."

And that appears to be exactly what he's doing.

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Photo: Twitter.