President Donald Trump on Thursday threatened to impose a massive tariff on European alcohol in response to the European Union’s retaliation against his steel and aluminum tariffs – a tit-for-tat escalation of a trade war that could easily get out of hand.

Alcohol has landed on the front lines of a global trade war, throwing French wines, Irish whiskeys, Kentucky bourbon, Japanese beer and Mexican tequila into the crossfire between the U.S. and its biggest trading partners.

Trump responded to the threat on social media. “If this Tariff is not removed immediately, the U.S. will shortly place a 200% Tariff on all WINES, CHAMPAGNES, & ALCOHOLIC PRODUCTS COMING OUT OF FRANCE AND OTHER E.U. REPRESENTED COUNTRIES,” Trump wrote. “This will be great for the Wine and Champagne businesses in the U.S.”