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Behind Obama's secret letter to Iran
Brian Katulis joins to discuss President Obama's letter to Ayatollah Khamenei about possible coordination between the U.S. and Iran over ISIS - and the political backlash the letter has caused.
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