Sunday on 'This Week': Donald Trump and Gov. Chris Christie

— -- Sunday, Republican presidential candidates Donald Trump and New Jersey Gov. Chris Christie come to “This Week.”

Plus, Fox News host Bill O’Reilly discusses his new book, “Killing Reagan.”

And, the powerhouse roundtable debates the week in politics with Rep. Keith Ellison, D-Minn; Rep. Tom Cole, R-Okla.; Fox News anchor Greta Van Susteren; and Matt Bai, national political columnist for Yahoo News

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

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