Populism and the liberal international order don’t mix well: The more populism there is, the less liberal the international order appears to become. Moreover, judging by the year-long presidency of Donald Trump, the liberal international order seems to be in particular danger if the most powerful state in the system catches the populist bug. Why is this so? Are populism and the liberal world order fundamentally incompatible? Can a populist be a leader of the free world?