China warned the Trump administration on Tuesday against reigniting trade tension by restoring tariffs on its goods next month, and threatened to retaliate against nations that strike deals with the United States to cut China out of supply chains.

Trump called the investigation into the former far-right leader of Brazil a “Witch Hunt that should end IMMEDIATELY.”

The letters listed a range of tariffs. Goods entering the U.S. from Japan, South Korea, Malaysia, Kazakhstan, and Tunisia will be subject to a 25 percent levy. There will be a 30 percent levy on South African and Bosnian goods, while imports from Indonesia will be subject to a 32 percent rate.

Early findings from an ongoing Harvard Business School study suggest tariffs are affecting retail prices for domestically sourced products.