Sunday on ‘This Week’: America in Crisis: Ambush in Dallas

— -- As the nation grapples with a week of violence, “This Week” co-anchor Martha Raddatz reports from the ground in Dallas following the shooting ambush that killed five police officers, and the aftermath from police-involved shootings in Louisiana and Minnesota.

Department of Homeland Security Secretary Jeh Johnson discusses the federal response to this week’s shootings. Plus, Trump campaign adviser retired Army Lt. Gen. Michael Flynn and Clinton supporter Rep. Joaquin Castro, D-Texas, discuss the political response to the violence.

And a special powerhouse roundtable discusses the aftermath of the week’s tragic events, with ABC News political analyst Matthew Dowd, presidential historian Doris Kearns Goodwin, ABC News senior legal correspondent Sunny Hostin, and “Nightline” co-anchor Byron Pitts.

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