Sunday on ‘This Week’: Ambassador Nikki Haley, Ash Carter, Sen. John McCain, and Dmitry Peskov

— -- As Congress and the FBI investigate Russia’s interference in the 2016 election, and global hotspots challenge the Trump administration, “This Week” co-anchor Martha Raddatz speaks with U.S. Ambassador to the United Nations Nikki Haley, former Defense Secretary Ash Carter, and Armed Services Committee Chair Sen. John McCain, R-Ariz., Sunday on “This Week.”

Plus, George Stephanopoulos goes one-on-one with Russian President Vladimir Putin’s Press Secretary Dmitry Peskov.

And the Powerhouse Roundtable takes on the week’s developments, with ABC News Chief White House Correspondent Jonathan Karl, Washington Post correspondent Anne Gearan, and Former National Counterterrorism Center Director Michael Leiter.

See the whole political picture, Sunday on “This Week.”

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