RIO DE JANEIRO (AP) — Brazilian President Luiz Inácio Lula da Silva said Thursday that he will impose retaliatory tariffs on the United States if President Donald Trump follows through on a pledge to boost import taxes by 50% over the South American country’s criminal trial against his predecessor, Jair Bolsonaro.

In a fiery escalation of U.S.-Brazil tensions, Donald Trump has publicly defended former Brazilian President Jair Bolsonaro, slamming Brazil’s legal proceedings against him as “very unfair.” Trump called Bolsonaro a “good man” and “tough negotiator,

Tensions between the United States and Brazil have suddenly burst open. Brazil’s president promised to reciprocate against President Trump’s tariffs.