US President Donald Trump on Friday repeated his threat to slap a 10% tariff on imports from members of the BRICS group of developing nations and said the group would end very quickly if they ever formed in a meaningful way.

"When I heard about this group from BRICS, six countries, basically, I hit them very, very hard. And if they ever really form in a meaningful way, it will end very quickly," Trump said without naming the countries. "We can never let anyone play games with us."