Mr. Trump has long expressed support for Bolsonaro, a right-wing populist sometimes known as "Trump of the Tropics."

Trump has said he will slap a 35% tariff on Canadian goods starting 1 August, even as the two countries are days away from a self-imposed deadline to reach a new deal on trade.

Trump has vowed to respond forcefully if countries seek to punish the U.S. by adding tariffs of their own.