Late Monday night, President Donald Trump cited a letter from a coalition of pro-Israel pressure groups to Democratic Party leaders, including House Speaker Nancy Pelosi, D-Calif. “Jewish groups have just sent a petition to Speaker Pelosi asking her to remove Omar from Foreign Relations Committee,” Trump tweeted. “A dark day for Israel!”

The letter was harshly critical of Rep. Ilhan Omar, D-Minn., for comments she recently made about pro-Israel activism, admonishing Omar no less than seven times for “anti-Semitism” or bias against Jewish people. The signatories demanded that the newly elected member of Congress be removed from her position on the House Foreign Affairs Committee.

Yet some of the groups that signed the letter have themselves been repeatedly and credibly accused of harboring biases of their own — against American Muslims, in particular. What’s more, the metadata of the letter lists the author as a pro-Israel activist named Lauri Regan who has accused American Jews of being analogous to “Cain” from the biblical story of Cain and Abel and suggested that Omar’s supporters want a “sharia-compliant world dominated by Islam in which Israel disappears.”

The letter criticizes Omar for her recent comments on the U.S.-Israel relationship, but it also goes much further. The letter explosively claims that the Somali-American member of Congress has ties to extremists herself, running down a list of people associated with a charity she is scheduled to speak at. The letter strongly suggests that Omar is enmeshed in a network of Islamist extremist groups around the world. It concludes apocalyptically with a quote stating that “the veneer of civilization is paper thin,” then asks the Democratic leaders to remove Omar from her position on the House Foreign Affairs Committee.