"Scathing", "searing" and "brutal" were just a few of the adjectives flying around social media on Sunday following an eloquent takedown of Donald Trump by ABC political editor Chris Uhlmann.

Speaking to Insiders from Hamburg, Uhlmann delivered a wrap on the G20 summit that has since gone viral, resonating with people from around the world and astonishing US political commentators.

The veteran journalist criticised the US President's conduct while in office, his awkwardness at the G20 summit and his offhand Twitter tirades.

"He was an uneasy, lonely, awkward figure at this gathering and you got the strong sense that some of the leaders are trying to find the best way to work around him," Uhlmann said.