ISIS Attacks Paris

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CIA Director John Brennan says Friday's attacks in Paris were planned in advance and that others are sure to be "in the pipeline." How should the US and its allies retaliate against ISIS — and strategize for the future?

Later on the program, the impact of the atrocities in Paris on America's presidential campaign. 

The Eiffel Tower is lit with the blue, white and red colours of the French flag in Paris, France, November 16, 2015, to pay tribute to the victims of a series of deadly attacks on Friday in the French capital. (Benoit Tessier/Reuters)