US president Donald Trump has threatened to impose an additional 10 per cent tariff on any nation aligning themselves with the “Anti-American policies” of the Brics group of developing countries as their leaders met in Brazil on Sunday.

President Trump threatened late Sunday to impose an additional tariff on countries that align themselves with the policies of BRICS nations, after the group expressed “serious concerns” over countries imposing unilateral tariffs.

President Donald Trump said the U.S. will impose an additional 10% tariff on any countries aligning themselves with the "Anti-American policies" of the BRICS group of developing nations, whose leaders kicked off a summit in Brazil on Sunday.