U.S. President Joe Biden warned against the rise of isolationism in the U.S. while visiting an American military cemetery in France that his predecessor, Donald Trump, famously skipped six years ago.

The World War I-era Aisne-Marne American Cemetery is the final resting place for soldiers who fought in the deadliest U.S. Marine Corps battle until then, Biden said, and he could not fathom "the idea that I’d come to Normandy and not make the short trip here to pay tribute.”

The U.S. president didn’t name Trump during a brief discussion with reporters after a wreath-laying ceremony and declined to answer a question about his expected 2024 opponent, but his target was unmistakable.