Los Angeles: Australia's strict merit based immigration policies received a thumbs up from from US President Donald Trump in the same early morning tweet praising Australian author and conservative activist Nick Adams.

"Nick Adams new book, Green Card Warrior, is a must read," Trump told his 25.8 million Twitter followers on Friday.

"The merit-based system is the way to go. Canada, Australia!"

Trump sent out the tweet after Adams was interviewed on Fox & Friends on Friday, the Trump friendly US morning TV show on Rupert Murdoch's Fox News cable network.