One year and a half after Donald Trump's return to the White House, almost every assumption underpinning the transatlantic relationship has been stress tested. Some have held, many have not.

Welcome to Navigating the Atlantic, this second season’s first episode. Today we are asking the question that frames this entire season. Is the Atlantic alliance still an alliance in any meaningful sense or is it becoming an alliance in name only ? To help us navigate this, we are joined by Ian Lesser, distinguished fellow at the German Marshall Fund of the United States in Brussels and chair in Transatlantic Affairs at the College of Europe in Bruges, Belgium.