At the end of his resignation speech Tricky Dicky famously says "au revoir" and tells there's no correct word in English to convey what he meant. Why weren't "We'll meet again" or "See you someday" for example appropriate to what Nixon wanted to say? "We'll see you again" does he eventually says.
And weren't American voters somewhat flummoxed by the use of a foreign word (and a French one at that!) in such a circumstance by an American president?