Do you feel confident that our drones, guided weapons, warships, will not be hacked?
HAGEL: I'm not confident of anything in this business. You can't be. But the fact is, Martha, it is -- it is a -- as dangerous a threat that -- that we are dealing with, the world deals with, especially the United States, as any one threat. It's quiet. It's insidious. It's deadly.
RADDATZ: And people aren't paying enough attention to this?
HAGEL: I do fear that's true. We are I'll tell you that -- that we are.
RADDATZ (voice-over): And one year into Hagel's tenure, he's facing a new issue. While the end of "Don't Ask, Don't Tell" means gays and lesbians can now serve openly, transgender service members can still be dismissed without question.
(on camera): Is that something that should be looked at again?
HAGEL: The issue of transgender is a bit more complicated, because it has a -- a medical component to it. These issues require medical attention. Austere locations where we -- we put our men and women in -- in many cases, don't always provide that kind of opportunity. I do think it -- it continually should be reviewed. I'm open to that, by the way. I'm open to those assessments, because, again, I go back to the bottom line. Every qualified American who wants to serve our country should have an opportunity if they fit the qualifications and can do it.
This is an area that we -- we've -- we've not defined enough.
(END VIDEO TAPE)
MARTHA RADDATZ, ABC NEWS ANCHOR: Now, our closer look at Florida senator, Marco Rubio. This week, the GOP star making what could be his biggest move yet toward a run for the White House, including a key stop in New Hampshire.
And Jon Karl was there with him.
JONATHAN KARL, ABC NEWS CORRESPONDENT: What's going on, Senator?
SEN. MARCO RUBIO (R), FLORIDA: Good to have you.
KARL: What's happening?
Welcome to New Hampshire.
(voice-over): We caught up with Marco Rubio in Manchester, New Hampshire, his first foray to the first in the nation primary state since the last presidential election.
It's likely to be the first of many. Rubio is doing everything he needs to do to prepare for a presidential run, campaigning for Republicans across the country, hiring national staff, raising lots of money and even writing a book on his vision for America.
(on camera): It seems obvious you're moving closer to running for president?
RUBIO: I've openly said in the past that it's something I will consider at the end of this year, that I'll look at a number of factors, personal factors, but also, uh, whether I could best promote this message and -- and actually put in place these ideas that I want to see put in place, whether I could best do that from the presidency as opposed to the Senate.
KARL: He told us if he decides to run for president, there is no backup plan. The day he announces he is running, he would announce he is not seeking reelection to the Senate.
RUBIO: If I decide to run for president, I will not have some sort of exit strategy to run -- to run for the Senate. And that...
KARL: That will be a decision not to run for reelection?
RUBIO: I believe that if you want to be president of the United States, you run for president.
KARL: It's all or nothing?
RUBIO: You don't run for president with some eject button in the cockpit that -- that -- that allows you to go on an exit ramp if it doesn't work out.
KARL: Do you think you're ready to be president?