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This Sunday, House Homeland Security Committee Chair Rep. Michael McCaul, R-Texas, discusses the latest on the threat from ISIS and the execution of American journalist James Foley, only on "This Week."

Plus, Rep. William Lacy Clay, D-Missouri, who represents Ferguson in Congress, discusses the unrest in Missouri.

And the powerhouse roundtable debates all the week's politics, with Rep. Donna Edwards, D-Maryland, ABC News contributor and Weekly Standard editor Bill Kristol, Wall Street Journal columnist Peggy Noonan, and ABC News contributor and former Obama White House senior adviser David Plouffe.

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

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