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Peter Kassig's letter to his parents
Chris Matthews finishes the show by reading a heartbreaking letter that Peter Kassig, the latest US victim of ISIS, wrote to his parents before he was killed.
Can Trump bring peace to Syria when Obama could not?08:07
What Americans forget about the War on ISIS05:25
Ret. Gen. on Syria: ‘We should not abandon the fight’08:54
'Cubs of the caliphate': Role of kids in ISIS06:36
A look at ISIS' scare tactics05:10
How ISIS mastered Internet recruitment06:21