New Zealand PM 'utterly' disagrees with Trump tweets

New Zealand Prime Minister Jacinda Ardern on Tuesday joined international condemnation of US President Donald Trump's xenophobic tweets about progressive Democrat congresswomen.

Ardern, the charismatic young leader who has been hailed as "the anti-Trump" by US media, said she proudly celebrated her country's diversity.

"Usually I don't get into other people's politics, but it will be clear to most people that I completely and utterly disagree with him," Ardern told Radio New Zealand.

Trump on Sunday urged a group of four Democratic congresswomen of colour -- three of them US-born -- to "go back" to the countries they came from, then renewed his attack on them a day later.

"If you're not happy here, you can leave... This is about love for America, certain people hate our country," he tweeted.

Ardern said New Zealanders welcomed diversity in the corridors of power.

"We take the view that our parliament should be a representative place, it should look and feel like New Zealand, it should have a range of different cultures and ethnicities," she said. "And never should a judgement be made about the origin of anyone, and their right, therefore, to be in parliament as a representative."