Mohamed Elibiary, a controversial senior adviser to the U.S. Homeland Security Department, stepped down Sept. 3 from his position after receiving backlash for a controversial post he made on Twitter in June.

Responding to a question about the Islamic State group, Elibiary wrote, "As I've said b4 inevitable that 'Caliphate' returns."

The tweet was part of a string of posts deemed inappropriate for a senior government advisor, including one where he said he considered the United States to be an "Islamic country" and another where he suggested that those in the national security "uber hawks camp misread 9/11."

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