"The State of Qatar has employed its ample financial resources to exert significant regional influence and avoid domination by Saudi Arabia, the de-facto leader of the six Gulf monarchy alliance called the Gulf Cooperation Council (GCC: Saudi Arabia, Kuwait, Qatar, United Arab Emirates, Bahrain, and Oman). [...] Qatar's independent policies, which include supporting regional Muslim Brotherhood organizations and establishing a global media network called Al Jazeera, have injured Qatar's relations with Saudi Arabia and some other GCC members who assert that the Brotherhood is a threat to regional and domestic security. [...] The Qatari government is helping the United States combat regional Islamist terrorist organizations. However, radical Islamist organizations profess ideologies that are attractive to some Qatari citizens, and there have been repeated accusations by international observers that Qatar's leaders condone contributions to these groups. Members of Congress generally have taken into account these and all the other aspects of Qatar's policies in consideration of U.S. arms sales to Qatar, such as a sale of F-15s signed in mid-2017."
CRS Report for Congress, R44533
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html