U.S. Strategy Against ISIS and the Future of the Caliphate

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th Marine Regiment, fire mortars from an undisclosed location in Syria. The United States’ main ally in Syria on Thursday, Dec. 20, 2018, rejected President Donald Trump’s claim
( U.S. Marine Corps photo by Cpl. Gabino Perez via AP )
Produced by Ellen Frankman
WGBH WNYC Studios