Frank Gaffney, former Assistant Secretary of Defense and Founder and President of the Center for Security Policy, comes on the show to talk about Donald Trump's foreign policy. NBC asks Jimmy Fallon to humanize Donald Trump. And we have this hour's top trending stories. Guests: Stephanie Gabriel, Frank V. Vernuccio, Susan Crabtree, Daniel Lippman. Trending Today USA 09-20-16 Part 5

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