Paris: France's far-right National Front leader, Marine Le Pen, voiced support for US Republican presidential candidate Donald Trump on Wednesday, saying his Democratic rival Hillary Clinton would bring war and hardship to the world.

Le Pen is a candidate in France's April 2017 presidential election. While her increasingly popular party thrives on anti-immigration sentiment, she has been more careful in her speeches than Trump has been so as to make her party more mainstream.

"As far as France's best interest is concerned it's 'Everything but Hillary Clinton'," Le Pen told CNN in an interview when asked which US candidate she would support.

"It's everything but Hillary Clinton because I believe Hillary Clinton means war, Hillary Clinton means devastation, destabilising the world, economic choices that would be devastating for my people, geostrategic choices that would lead to global conflicts."