Brazilian President Luiz Inacio Lula da Silva will sign on Monday a decree setting criteria for his government's response to foreign trade measures hurting the Brazilian economy, his chief of staff Rui Costa told journalists in Brasilia.

The Brazilian president promised to respond in kind if Trump moves forward with a threatened 50 percent tariff.

Brazil’s President forcefully rebuked Trump after the U.S. leader called the prosecution of Lula’s predecessor, Bolsonaro, a “witch hunt” and hiked tariffs on the Latin American nation.