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Sunday on "This Week," with turmoil in Egypt and new accusations of chemical weapons use in Syria, we cover the latest on the Middle East in crisis and how the U.S. will respond, with ABC News Chief Global Affairs Correspondent Martha Raddatz on the ground live from Cairo.

And the powerhouse roundtable debates all the week's politics, with ABC News' George Will and Cokie Roberts, Democratic strategist and ABC News contributor Donna Brazile, and Washington Post Chief Correspondent Dan Balz.

Plus, ABC News Chief National Correspondent Byron Pitts examines the legacy of Martin Luther King Jr.'s "I Have A Dream" speech 50 years after the March on Washington, with reflections from Rep. John Lewis, D-Georgia, the last living speaker from the march, and former Atlanta mayor and civil rights leader Andrew Young.

See the whole political picture, Sunday on "This Week."

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