Keith Ellison  was under investigation for failure to disclose that a group that paid for his trip to Mecca also has Muslim Brotherhood ties.
 "Ellison has associated with the Muslim American Society, a Virginia-based group founded by Muslim Brotherhood members in 1993 to act as the "overt arm of the Muslim Brotherhood in the United States," according to federal prosecutors in 2007. The United Arab Emirates recently added the group to a list of terrorist organizations."
And if you think the Muslim Brotherhood is simply a social group, I've got some hot land to sell you right outside of Hilo.

http://freebeacon.com/politics/muslim-brotherhood-tied-group-paid-keith-ellison-visit-mecca-2008/