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This week with George Stephanopoulos starts right now.

Homegrown terror.

14 killed, dozens injured in a New Year's Day attack.

To all the people of Norlands, I grieve with you.

Our nation grieves with you.

Law enforcement officials searched for how and why the killer radicalized.

He was 100% inspired by ISIS.

And exclusive with the Homeland Security Secretary on the investigation and the national threat environment.

And Texas Republican Congressman Michael McCall on ISIS efforts to exert influence at home and abroad.

And Mike Johnson holds on as House Speaker. It is the great honor of my life to serve this body with all of you.

Our powerhouse roundtable on the agenda head, plus Dr. Ashizs-Jah on growing concerns over the threat from bird flu.

And...

Let us create together a new national spirit of unity and trust.

The nation reflects on the life and legacy of America's longest living president as he's laid to rest.

From ABC News, it's this week, Here now, George Stephanopoulos.

Good morning and welcome to this week. In the wake of the New Year's Day terror attack in New Orleans, security officials across the country are on high alert for a series of high profile events now feared to be targets.

...