Prime Minister Scott Morrison and US President Donald Trump will open a new paper mill for billionaire businessman Anthony Pratt.

Donald Trump's titanium man and Australia's cardboard king will move the celebration of the US-Australian alliance to America's midwest today.

Prime Minister Scott Morrison - who the US president dubbed a "man of titanium" when they met at the White House - will join Mr Trump to open billionaire businessman Anthony Pratt's newest factory in Wapakoneta, Ohio.

The state is in Mr Trump's heartland and it's no accident that Mr Pratt, who has cultivated a close relationship with the president, chose the location to build his biggest paper mill yet.