Sunday on 'This Week': Donald Trump, Ben Carson and Martin O'Malley

— -- Republican presidential candidates Donald Trump and Ben Carson and Democratic presidential candidate Martin O’Malley come to “This Week” Sunday.

And, ABC News’ Martha Raddatz reports from overseas on the latest in the fight against ISIS.

Plus, the powerhouse roundtable debates the week in politics with democratic strategist and senior CNN political commentator David Axelrod, ABC News analyst Matthew Dowd, Democratic congressman and Progressive Caucus co-chair Rep. Keith Ellison, and Republican congresswoman and retired Air Force colonel Rep. Martha McSally. See the whole political picture, Sunday on "This Week."

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