The European Union presidency on Tuesday warned that the foundations of democracy will be put to the test during the November U.S. election, envisaging a scenario where the longstanding trans-Atlantic alliance could unravel ever more.

Prime Minister Alexander De Croo of Belgium, whose country currently holds the rotating EU presidency, said that “if 2024 brings us ‘America first’ again, it is really more than ever ‘Europe on its own.’”

De Croo spoke in an address to the EU legislature only hours after former President Donald Trump’s landslide win in the Republican Party’s Iowa caucuses.

His words harked back to the 2017-2021 Trump administration, when U.S. relations with Europe took a nosedive because of near-incessant trans-Atlantic quarrels about trade, security and military cooperation that eroded trust and cooperation.