President Donald Trump on Wednesday threatened Brazil with a crippling tariff of 50% starting August 1, according to a letter he sent to the country’s president, Luiz Inácio Lula da Silva.

In the letter posted on Truth Social, Trump alleged Lula is undertaking a “Witch Hunt that should end IMMEDIATELY!” over charges against its right-wing former president, Jair Bolsonaro.

Bolsonaro, who has bragged about his closeness with Trump, is facing trial for allegedly attempting to stage a coup against Lula.

CNN has reached out to Brazil’s Ministry of Foreign Affairs.

Unlike the 21 other countries that have received letters from Trump this week, Brazil was not set to face “reciprocal” tariffs in April. Goods from there have instead been tariffed at a minimum of 10%, which is the rate Trump has been taxing most goods from countries that were set to face “reciprocal” tariffs.