According to 9News, leaked audio from the event revealed Turnbull making multiple jokes at Trump's expense as he recalled their meeting in New York last month.
"It was beautiful. It was the most beautiful putting-me-at-ease ever," Turnbull quipped during the event.
Later, he even began impersonating the president.
"The Donald and I, we are winning and winning in the polls. We are winning so much, we are winning, we are winning like we have never won before," he said.
Then, referencing the investigation into Trump campaign's possible links to Russia during the 2016 election, Turnbull added: "I have this Russian guy. . .Believe me, it's true, it is true."
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