Explainer: Who is Australian journalist Jonathan Swan who spoke to US President Donald Trump in the 'car crash' interview?

On Tuesday (NZ time), HBO aired an interview with US President Donald Trump that quickly went viral and was labelled a "car crash".

In the interview Trump was unconvincing as he said the US has the COVID-19 pandemic under control despite having the most cases in the world. 

The Australian reporter who interviewed him, Axios national political correspondent Jonathan Swan, has been praised for confronting Trump and remaining calm as he probed him on issues such as his handling of the pandemic.

Here's a brief look at who Swan is and his history with Trump:

He's been called a "star White House reporter" by The New York Times: "He has scaled journalism's most competitive beat with brute force.

"To cover Mr Trump's White House is to play in a treacherous arena," a 2018 report on Swan says.

Swan's expertise is a mix of advertising and journalism, previously working for the Sydney Morning Herald before moving to the US on a scholarship at Johns Hopkins University. He then took up a role at The Hill, a news website based out of Washington.

After his first taste of the White House he became Axios' national political correspondent when the news site was launched in 2017, news.com.au reports.

So what do Americans think of him?

Swan has been lauded for his latest interview with Trump but it hasn't always been that way.

In an interview with the President in 2018, Swan was seen smiling as he probed Trump into confirming he wanted to stop immigrant children from receiving automatic US citizenship.

"I'm not used to having my facial expression recorded," he said in a Slack message to colleagues at the time, seen by the NYT. "I wish I could redo that moment."

But the tides have turned and this time around, he's been mostly praised for his approach. Jeffrey Goldberg, the editor of US magazine The Atlantic, said it was "one of the best interviews I've ever seen".

Speaking to CNN after the interview with Trump aired, Swan talked of how Trump attempted to "litigate" the US' COVID-19 death toll.

The country's death rate has continued to climb to 156,000 and is reporting nearly 1000 deaths per day.

"Right now, I think it's under control," Trump said. 

"How? 1000 Americans are dying a day," Swan replied.

Swan said there was no avoiding the fact more than 150,000 people had died.

"He [Trump] brought his own charts to present to me that America was actually doing better than the rest of the world," Swan told CNN.

"It was a really striking exchange to have with the President of the United States."

Back in Swan's homeland, Australian broadcasters have also been full of praise. Leigh Sales, a presenter for the ABC, said he nailed the tone of the interview.

"This is an absolute cracker of an interview - easily the best I've seen with Trump," she wrote on Twitter, adding it was "great journalism but it's also massively entertaining".