Sunday on 'This Week': Sen. Marco Rubio

— -- Just three weeks before the first votes are cast in Iowa, GOP presidential candidate Sen. Marco Rubio speaks exclusively to “This Week” Sunday.

Plus, White House Chief of Staff Denis McDonough and Senate Majority Leader Mitch McConnell preview President Obama’s final State of the Union address.

And, the powerhouse roundtable debates the week in politics, with ABC News contributor and Democratic strategist Donna Brazile, ABC News political analyst Matthew Dowd, radio host Hugh Hewitt, and television and radio host Tavis Smiley.

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

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