Sunday on 'This Week': Mick Mulvaney, Julián Castro, Al Gore

ABC News Chief White House Correspondent Jonathan Karl goes one-on-one with Acting White House Chief of Staff Mick Mulvaney and Democratic presidential candidate Julián Castro on “This Week” Sunday.

Plus, former Vice President Al Gore comes to “This Week” to discuss climate change and the 2020 Democratic primary.

And the Powerhouse Roundtable debates all the week’s politics with ABC News Political Director Rick Klein, former North Dakota senator and ABC News contributor Heidi Heitkamp, Democratic strategist Stefanie Brown James, and LA Times columnist Jonah Goldberg.

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