Sunday on 'This Week': Sen. Cory Booker, Rep. Mac Thornberry, Adm. Mike Mullen

Just days ahead of the first Democratic debates, “This Week” Co-Anchor Martha Raddatz goes one-on-one with 2020 presidential candidate Sen. Cory Booker, D-N.J., only on “This Week” Sunday.

Plus, the top Republican on the House Armed Services Committee Rep. Mac Thornberry, R-Texas, and former Chair of the Joint Chiefs of Staff Adm. Mike Mullen discuss the growing tensions with Iran.

And the Powerhouse Roundtable debates all the week’s politics, with ABC News Political Analyst Matthew Dowd, Republican Strategist and ABC News Contributor Sara Fagen, Democratic Strategist Arshad Hasan and NPR White House Reporter Ayesha Rascoe.

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