J. Scott Applewhite/AP Photo|Pablo Martinez Monsivais

Sunday on "This Week," as Washington faces a looming showdown over the budget and a potential government shutdown, we speak to two key players in the debate - Budget committee ranking member Rep. Chris Van Hollen, D-Md., and Rep. Tom Graves, R-Ga., who's leading the latest charge to defund Obamacare.

And our powerhouse roundtable tackles all the week's politics, with former House speaker and CNN "Crossfire" co-host Newt Gingrich, University of California, Berkeley professor and former Clinton Labor secretary Robert Reich, PBS "NewsHour" co-anchor and managing editor Gwen Ifill, and ABC News Chief White House Correspondent Jonathan Karl.

Plus, we cover the latest on the Navy Yard shooting investigation and examine the fallout from the country's latest deadly mass shooting.

And in our "Sunday Spotlight," tennis great Billie Jean King reflects on the 40 th anniversary of her historic victory in the "Battle of the Sexes" match with Bobby Riggs.

See the whole political picture, Sunday on "This Week."

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