A New York-based ultra-Orthodox rabbi who has posted thousands of popular outreach lectures online said in a lecture that only about 1 million halachic Jews, meaning people born of a Jewish mother, perished in the Holocaust

In a video, Rabbi Yosef Mizrachi cited high assimilation rates in Europe before World War II to make his claim that 80% of those identified as Jews killed by the Nazis during the Holocaust were not Jewish according to halakha, or Jewish law.