Donald Trump's held a state dinner at the White House for Australian Prime Minister Scott Morrison.

It's only the second such dinner the US President's hosted for a foreign leader during his three years in office, and the last for an Australian leader since John Howard in 2006.

Earlier, in their first meeting in the Oval Office, Trump called Morrison a 'man of titanium' - a reference to George W. Bush's "man of steel" compliment for Howard during his visit.

The Australian's Cameron Stewart told Sky News it's a big moment for Morrison.

He says Morrison hasn't been Prime Minister for that long - but has been lucky enough to be given an incredible state reception.