President Donald Trump has threatened new tariffs on any nation supporting “anti-American” policies of the BRICS group of emerging economies, as he announced tariff letters would be sent out to scores of countries from Monday,

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 major summit in Brazil on Sunday.

The president said the levy will apply to "any country aligning themselves with the Anti-American policies of Brics".