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.

A tariff of “30%, or anything above 30%… has more or less the same effect. So, practically it prohibits the trade,” Maroš Šefčovič, the EU’s trade commissioner, said as he arrived ahead of an EU ministerial meeting in Brussels on Monday.

Šefčovič said it will “be almost impossible” for the bloc to continue its current level of trade with America if that new tariff rate is implemented on August 1 – the date stipulated by US President Donald Trump in his letter to the EU on Saturday.

“If (the tariff) stays 30 (percent) plus, simply trading as we know it will not continue, with huge negative effects on both sides of the Atlantic,” he added. “I will definitely do everything I can to prevent this super-negative scenario.”

In a press conference following the meeting, Šefčovič said reiterated that the EU’s preferred outcome is a negotiated deal with Washington and that he plans to speak to his US counterparts late Monday.