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.

Voicing "serious concerns about the rise of unilateral tariff" measures, BRICS members said the tariffs risked hurting the global economy, according to a summit joint statement.

Brazil plays host to a summit of the BRICS bloc of developing economies Sunday and Monday during which pressing topics like Israel’s attack on Iran, the humanitarian crisis in Gaza and trade tariffs imposed by U.