The attacks by ISIS on the citizens of Paris and the world have again focused attention on the challenges of counterterrorism. In this Teleforum, former U.S. Secretary of Homeland Security Michael Chertoff and prominent French lawyer Francois-Henri Briard addressed issues such as international cooperation on surveillance and intelligence sharing, whether policies on encryption of electronic communications need to be revised, what authorities or international institutions, if any, should be called upon in support of the use of force against ISIS, and the nature of the response from France, the U.S., Russia, and other nations. -- Featuring: Francois-Henri Briard, Supreme Court Attorney (France), Delaporte, Briard & Trichet and Michael Chertoff, Executive Chairman and Co-Founder, The Chertoff Group.