US President Biden concluded his March 27, 2022 speech in Poland with the words
For God’s sake, this man cannot remain in power.
(e.g. CBS News's video Biden says Putin "cannot remain in power" at 26:37)
Question: How often has a post WWII US president said publicly that the leader of another country must go?
I'm not asking about actions (covert or otherwise), I'm asking about highly visible public statements in a speech or via a definitive statement by an official White House spokesperson that the leader of a country must no longer be its leader in no uncertain terms.