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All In with Chris Hayes is an American news television program that airs weekdays at 8:00 p.m. ET on MSNBC. It is hosted by Chris Hayes, who previously hosted Up with Chris Hayes on MSNBC weekends. The show premiered on April 1, 2013. Similar to Up, the show's format consists of "long-form panel discussions in which the participants talk through several issues." The opening night had 859,000 total viewers, including 298,000 in the ages 25–54 demographic. Guest hosts for the series include Mehdi Hasan, Ayman Mohyeldin and Alicia Menendez.