Sunday on ‘This Week’: Nikki Haley, Sen. Tom Cotton and Sen. Bernie Sanders

— -- This Sunday, George Stephanopoulos goes one-on-one with U.S. Ambassador to the U.N. Nikki Haley, Intelligence Committee member Sen. Tom Cotton, R-Ark., and Budget Committee ranking member Sen. Bernie Sanders, I-Vt.

Plus, former U.S. attorney Preet Bharara and ABC News chief legal analyst Dan Abrams discuss the latest in the Russia investigation.

And the Powerhouse Roundtable debates the week in politics, with ABC News political analyst Matthew Dowd, Democratic strategist and Obama 2012 deputy campaign manager Stephanie Cutter, Republican strategist and Bush White House political affairs director Sara Fagen, TV One host Roland Martin, and American Conservative Union chair Matt Schlapp.

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