The deal, announced Sunday by President Trump and European Commission President Ursula von der Leyen, imposes a 15% U.S. tariff on most EU imports, while American goods exported to the union's 27 member countries will face no tariffs. Previously, U.S. exports to the EU faced an average tariff of roughly 1%, according to Goldman Sachs analysts.

"I think it's the biggest deal ever made," Trump said of the new agreement, which will reduce the bloc's tariff rate to 15 percent.