COSTELLO: The threat from foreign fighters, including ISIS, now the focus on Capitol Hill. The House Foreign Affairs joint subcommittee is now holding a hearing. Chilling words from the chairman, Ileana Ros-Lehtinen. Foreign fighters are joining ISIS by the tens of thousands and are an unprecedented threat to national security. That's the testimony right now. Of course, we'll continue to monitor this and keep you posted. OK, onto 2016 and the race for president. Yes, we have to talk about it. Will Jeb Bush run? He says he's thinking about a run for the White House, even plans to decide soon. And while he mauls over the move, he's considering strategy.</s>JEB BUSH (R) FORMER GOVERNOR OF FLORIDA: I don't know if I'd be a good candidate or a bad one. I know -- I kind of know how a Republican can win, whether it's me or somebody else. And it has to be much more uplifting, much more positive, - much more willing to be practical now in Washington world, lose the primary to win the general without violating your principles. It's not an easy task to be honest.</s>COSTELLO: An honest man, I like that. Jeb Bush is not the only big name that GOP voters would like to see on a presidential ballot. CNN's John King is here with a cast of thousands. Good morning.</s>JOHN KING, CNN CORRESPONDENT: Almost, Carol. Look, you'd have to consider Jeb Bush if he runs and when you talk to Republicans, he's getting more serious about the phone calls to lay the ground work. But he's still in if. If he runs he would be formidable, but look at these numbers. There's no front-runner. You can't give anybody the front-runner except maybe Mitt Romney. Our brand new poll, if Mitt Romney were to run again, and he says, Carol, no, no, no. He would be a 20 percent. Dr. Ben Carson, a ten percent.
Discussing ISIS Threat on Capitol Hill