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Sunday on "This Week," Sen. Ted Cruz, R-Texas, takes on President Obama's response to ISIS.

Plus, Counterterrorism and Intelligence Subcommittee Chair Rep. Peter King, R-New York, and Armed Services Committee Ranking Member Rep. Adam Smith, D-Washington, discuss the latest on the terror threat from ISIS and the U.S. response.

And the powerhouse roundtable debates all the week's politics, with Yahoo News national political columnist Matt Bai, ABC News contributor and Democratic strategist Donna Brazile, ABC News chief White House correspondent Jonathan Karl, ABC News contributor and Weekly Standard editor Bill Kristol, and ABC News special contributor and FiveThirtyEight editor-in-chief Nate Silver.

Plus, Interior Secretary Sally Jewell speaks with "This Week" from Acadia National Park for the 50 th anniversary of the Wilderness Act.

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

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