Sunday on ‘This Week’: Tom Bossert, Jeh Johnson, Sen. Chris Coons, Vicky Ward

In the aftermath of the mass shooting on two mosques in New Zealand, former Trump Homeland Security and Counterterrorism Adviser Tom Bossert and former Obama Homeland Security Secretary Jeh Johnson come to “This Week” Sunday.

And the Powerhouse Roundtable debates the week in politics, with ABC News Political Analyst Matthew Dowd, former New Jersey Governor and ABC News Contributor Chris Christie, New York Times National Immigration Reporter Caitlin Dickerson, former New Orleans Mayor Mitch Landrieu, and Republican Strategist and CNN Political Commentator Alice Stewart.

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