TRUMP COUNTERTERRORISM ADVISER SEBASTIAN GORKA SAYS THE MUSLIM BROTHERHOOD, 'FOUNDED IN EGYPT IN 1928 BY HASSAN AL-BANNA', IS 'BUILT UPON OLD CONCEPTS OF JIHAD, BUT IT'S ALSO MIXED IN WITH MARXISM', CALLING IT 'A HYBRID THREAT' AND SAYING THE 'VANGUARD CONCEPT' LATER POPULARIZED BY BIN LADEN IS 'A CLASSIC LENINIST-MARXIST CONCEPT'.