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.

Leaders of the BRICS group of emerging economies meeting for their annual summit had hoped to downplay any differences with the U.S. But even a toned down group proclamation drew the ire of President Trump.

The BRICS bloc has criticized rising tariffs and attacks on Iran in its latest summit declaration. Meeting in Rio de Janeiro on Sunday, the group also condemned NATO’s increased military spending and expressed concerns about global trade disruptions caused by tariffs.