Sunday on ‘This Week’: Rudy Giuliani and Sen. Bernie Sanders

— -- After the blockbuster first presidential debate, Trump campaign adviser and former New York City Mayor Rudy Giuliani and former presidential candidate Bernie Sanders come to “This Week” Sunday.

Plus, is the 2016 election in danger of being hacked by Russia? Our expert panel weighs in, with ABC News contributor and former White House counterterrorism adviser Richard Clarke, Foreign Policy Magazine columnist and Politico Magazine contributing writer Julia Ioffe, Human Rights Foundation Chair, Russian pro-democracy leader, and former world chess champion Garry Kasparov, author of the new book “Winter is Coming,” and House Intelligence Committee Ranking Member Rep. Adam Schiff, (D-California).

And the Powerhouse Roundtable debates the week in politics, with ABC News chief White House correspondent Jonathan Karl, ABC News’ Cokie Roberts, Republican strategist and CNBC contributor Sara Fagen, Bloomberg Politics managing editor John Heilemann, and host and managing editor of TV One’s “News One Now” Roland Martin.

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

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