Liquor lobbyists gathered in a ritzy private club on a recent rainy evening in Brussels to swill cocktails with names like “Toasts Not Tariffs” and fret over the potential disaster confronting their industry. Again.

Seven years ago, the spirits industry found itself a casualty in a worldwide trade war as President Trump unleashed tariffs on America’s partners. The European Union retaliated with a spate of tariffs that included a 25 percent charge on American whiskey — aiming to deliver a blow to Senator Mitch McConnell, Republican of Kentucky and the then majority leader. A series of tit-for-tat tariffs followed, hitting spirits from rum to cognac on both sides of the Atlantic.

The levies were suspended during the Biden administration, but with Mr. Trump back in office and trying to rewrite the rules of global trade once again, alcohol is back in the crossfire.

The European Union suspended the tariffs in question in 2021 and extended that decision in 2023, but the hiatus lasts only until March 31. After that, ramped-up tariffs of 50 percent will automatically apply to American whiskey, and charges will hit a range of other goods, including motorcycles.

But it is the spirits industry that has been the most vocal about the risks the levies pose. Industry leaders and craft distillers say the taxes would decimate their export business, especially in growth markets like Germany and France, while risking retaliatory tariffs that would hit other kinds of alcohol.

Bars have been importing extra bottles to try to get ahead of a trade war, distilleries have been putting overseas expansion plans on ice, and industry leaders have been flocking to Brussels, Washington and Rome, where Prime Minister Giorgia Meloni has become Mr. Trump’s bridge to Europe, to try to convince policymakers to help them avoid the looming pain of tariffs.