When video footage from 2010 of then-Muslim Brotherhood leader Mohamed Morsi calling Jews "the descendants of apes and pigs" surfaced two weeks ago, it properly focused international attention on the Brotherhood's bigoted ideology. Morsi's comments, after all, are just the tip of the iceberg for the Brotherhood, which has long argued that Egyptian Christians should be barred from running for president, and which recently pushed through a new constitution that denies religious rights to Baha'is and Shiites.

Given that the Muslim Brotherhood is now Egypt's ruling party and Morsi is Egypt's president, the international community must challenge the Brotherhood on its many hatreds to ensure that they are never acted upon. In this vein, Morsi's visit to Germany on Wednesday represents an important opportunity to force him to recant perhaps the vilest example of the Brotherhood's intolerance: its denial of the Holocaust.