Sunday on ‘This Week’: Donald Trump and Sen. Marco Rubio

— -- GOP presidential candidates Donald Trump and Florida Sen. Marco Rubio, comes to “This Week” following the second Republican presidential debate.

Plus, New York City’s Mayor Bill de Blasio discusses the Pope's upcoming trip to the U.S. and the race for the Democratic nomination for president.

Then, the Powerhouse Roundtable debates the week in politics, with ABC News contributor Matthew Dowd, ABC News contributor and Republican strategist Ana Navarro, ABC News’ Cokie Roberts, and Democratic strategist and ABC News contributor Donna Brazile.

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

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