The European Union has warned that its trade with the United States could be effectively wiped out if Washington makes good on its threat to slap a 30% tariff on goods imported from the bloc.

President Donald Trump on Tuesday said the U.S. would impose a 19% tariff on goods from Indonesia under a new agreement with the Southeast Asian country and more deals were in the works as he continued to press for what he views as better terms with trading partners and ways to shrink a huge U.

Italy's foreign minister warned that, while he hopes for successful negotiations, the EU will respond resolutely to Trump's latest tariff threat.

European Union officials have drawn up plans to impose levies on American imports, but questions abound about whether they would go through with them.

U.S. President Donald Trump said he believed Britain would fight to defend the United States but suggested he could not say the same for the European Union, a factor in his decision not to sign a trade deal with the bloc.