Sunday on 'This Week': Sen. John Cornyn and Sen. Chris Van Hollen

Cornyn and Van Hollen will appear on "This Week" Sunday.

Plus, Dean of Columbia Business School and former chair of the Bush Council of Economic Advisers Glenn Hubbard and Nobel Prize-winning economist, New York Times columnist and ABC News contributor Paul Krugman discuss the GOP tax plan and its potential impact on the economy.

And the Powerhouse Roundtable debates the week in politics, with ABC News senior congressional correspondent Mary Bruce, ABC News political analyst Matthew Dowd, Republican strategist and Bush White House Political Affairs Director Sara Fagen, Open Society Foundations Incoming president and Obama White House Political Affairs Director Patrick Gaspard, and Associated Press Washington bureau chief Julie Pace.

Like “This Week” on Facebook here. You can also follow the show on Twitter here.

Go here to find out when “This Week” is on in your area.