Defense secretary chuck Hagel issuing the strongest warning yet about Isis calling the group a, quote, imminent threat. ABC's Martha Raddatz has more on all this and, Martha, what do we know this... See More
Defense secretary chuck Hagel issuing the strongest warning yet about Isis calling the group a, quote, imminent threat. ABC's Martha Raddatz has more on all this and, Martha, what do we know this morning about what military action the U.S. Might take? Reporter: Well, robin, there have been nearly 100 U.S. Air strikes, fighter jet, bombers, armed drones on Isis targets in Iraq and they expect many more in the coming days. But U.S. Officials also making it clear this is not a knockout blow and they expect Isis to regroup. Secretary of defense chuck Hagel is using that alarming language saying Isis poses an imminent threat to every interest we have, whether it's in Iraq or anywhere else saying, Isis is as sophisticated and well funded as any group that we have seen. They're beyond just a terrorist group. We must prepare for everything and the only way you do that, you take a cold, steely, hard look at it and get ready. Very, very strong language, robin. Tough talk from the administration. No doubt bit, Martha. But are there limbs to what the U.S. -- The action they might take, limbs? Reporter: We've heard the president say over and over no combat boots on the ground and as you know there have been no U.S. Air strikes in Syria where Isis has a haven, even the chairman of the joint chiefs saying emphatically you could not defeat Isis without addressing the problem in Syria. But he also said he was not predicting that the U.S. Would launch air strikes there, although he did not rule that out, robin. Okay, Martha, thank you very much. And we'll have much more on this Sunday on "This week" with George. Learn more about Isis on our website, goodmorningamerica.com on Yahoo! A lot want to know more. We'll turn to that recover I
This transcript has been automatically generated and may not be 100% accurate.