For years, President Joe Biden has downplayed his tendency to misspeak, dubbing himself the “gaffe machine,” as if this is an endearing trait rather than a problematic one. But this weekend, we were reminded that Biden’s ad-libbing is a real liability — especially in the middle of a foreign crisis.

Speaking in Poland on Saturday, Biden went off-script and ended his speech with a declaration that Russian dictator Vladimir Putin needs to be deposed. “For God’s sake,” he said, “this man cannot remain in power.”