>>3810 A similar situation happened this April where the president of Finland Sauli Niinistö had a 50 euro bill in his breast pocket after the swearing-in ceremony of the new Finnish government. It made headlines in Finland.
Yesterday it was reported in Finland that Niinistö and Trump are going to meet in the White House on October 2 and hold a joint press conference, so the mystery bill could indeed be a reference to Niinistö.