What Action Will Obama Take Against ISIS?

ABC News' Martha Raddatz reports the latest on U.S. airstrikes in Iraq and President Obama's emerging coalition to take on ISIS.
3:26 | 09/07/14

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Transcript for What Action Will Obama Take Against ISIS?
on ABC's "This week." Breaking overnight. The president set to announce new strategy as U.S. Planes strike brand-new Isis targets. Also breaking this weekend, T Obama backs down on immigration reform. We have full analysis and reaction from top tea party critic, Ted Cruz. And election day countdown. Control of congress at stake. Stats guru Nate silver reveals his latest picks. Are republicans a lock to retake the senate? From ABC news, "This week" with George stephanopoulos begins right now. And we begin with the latest in the battle against Isis. The significant expansion of the campaign inside Iraq. And news that the president will lay out his new strategy this Wednesday in Washington. Martha Raddatz is here with all the latest. Good morning. Good morning, George. The president's speech will lay out a strategy to destroy Isis, far beyond what he's proposed in the past. A complicated, long-term and urgent mission that could likely mean air strikes in Syria. Day after day, the brutality of Isis stuns the world. This week, images of the horrific execution of a second American reporter. And over the weekend, a mass grave discovered. 15 bodies, each shot in the head, and vows from the terrorist group in Iraq and Syria that America should be on guard. Americans should be very concerned. This in many respects represents the most significant threat that the country has seen since September 11th. Reporter: A threat by a jihadist group that the president says cannot be merely contained, it must be destroyed. We're going to degrade and ultimately defeat isil, the same way we went after Al Qaeda. Reporter: Meaning hunting down the leaders with drones and manned aircrafts and relentlessly pounding fighters seeking to overtake more territory. Overnight, expanded air strikes were announced in Iraq to help the Iraqi security forces hold on to the dam. All this, while the president helps build an international coalition to help with the fight. But the major question, will the U.S. And that coalition launch air strikes into Syria? The chairman of the joint chiefs of staff said last month, you can't just focus on Iraq. Can they be defeated without addressing that part of the organization that resides in Syria? That answer is no. That will have to be addressed on both sides of what is essentially, at this point, a nonexistent border. Reporter: The U.S. Already flying surveillance missions over Syria, looking for possible targets. Images of a predator drone spotted by Syrian rebels in the northern part of the country hit the internet on Friday. The president is not expected to announce any further action in Syria in his speech this week. He'll be laying the ground work and the reasons it may be necessary. But one of the concerns of going into Syria, taking out Isis in Syria is that it will strengthen our other adversary, president Assad. But the conversations are this, is the threat to the U.S. Homeland greater than the threat of leaving Assad in power? They're siding with the threat to the homeland.

This transcript has been automatically generated and may not be 100% accurate.

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