The actress and television personality said on ABC's The View that the Nazi genocide of the Jews involved "two groups of white people".
Critics pointed out that Hitler himself had vented his hatred of the Jews in racial terms. She later apologised.
The Nazis, who believed themselves an Aryan "master race", murdered six million Jews in the Holocaust.
Monday's discussion was sparked by a Tennessee school board's ban of a graphic novel about Nazi death camps during World War Two.
Maus, which depicts Jews as mice and Nazis as cats, has won a number of literary awards.
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