All In with Chris Hayes 09/05/13

Kerry warns inaction on Syria will encourage extremism

Secretary of State John Kerry sat down with MSNBC's Chris Hayes for an exclusive interview about possible strikes against the Syrian government, saying, "If we don’t do this, Assad will have a message that he can use these weapons with impunity." See the full interview tonight at 8 p.m. on "All In with Chris Hayes." ... more Duration: {{video.duration.momentjs}}