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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.

One article:
https://www.is.fi/politiikka/art-2000006084076.html (link in Finnish)

President Niinistö is a pro-EU globalist.

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.

https://yle.fi/uutiset/osasto/news/niinisto_trump_to_meet_next_month/10977930 (link in English)