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 BRICS leaders voiced "serious concerns about the rise of unilateral tariff and non-tariff measures," warning they are illegal and arbitrary, according to a final summit statement.