Anderson Cooper speaks with former United Nations Secretary General Kofi Annan about the challenges he faced trying to negotiate peace in Syria. Annan responds to critics who question the approach and effectiveness of the U.N. and talks about dealing with the regime's lies. His tactic was to appeal to them and implore them to "do the right thing." "You have to press them, you have to let them know that you don't believe what you are being told," Annan said.
Watch a preview of the interview and see more at 8 and 10 p.m. ET.
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