Sunday on ‘This Week’: British Prime Minister Theresa May, Lt. Gen. H. R. McMaster and Rep. Adam Schiff

— -- After Friday’s terror attack on London’s subway, George Stephanopoulos speaks exclusively with British Prime Minister Theresa May, Sunday on “This Week.”

Plus, White House National Security Adviser Lt. Gen. H. R. McMaster and House Intelligence Committee ranking member Rep. Adam Schiff come to “This Week.”

And the Powerhouse Roundtable debates the week in politics, with Republican strategist and ABC News contributor Alex Castellanos, Open Society Foundations vice president and former U.S. Ambassador to South Africa Patrick Gaspard, ABC News Chief White House Correspondent Jonathan Karl, Republican strategist and CNN political commentator Alice Stewart, and editor and publisher of The Nation Katrina vanden Heuvel.

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

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