London CNN  — 

The first 100 days of an American presidency is as much about setting a tone as it is about getting things done. In President Joe Biden’s case, his message to the world has been loud and clear: Donald Trump’s “America First” isolationism is over. “America is back. Diplomacy is back,” Biden proclaimed in his first foreign policy speech in February.

But the specter of Trump is already haunting Biden’s mission to reengage with the world and lead it once again. Traditional US allies who spent the past four years unable to establish stable relations with the White House are now wondering if they can take Biden