Red lines are kind of political arguments that are used to try to put people in a corner.

If the Iraqis fail to implement the reforms, if they fail to get a handle on the violence, there's nothing the United States can do, militarily or otherwise, that can solve those problems. They have to assume the primary responsibility to govern themselves.

Obama really does recognize the threats that are out there; I think he understands the world. He understands the role of America in that troubled world.

Clearly, Russia has lied to the world about what's going on in Ukraine. They have clearly violated the cease-fire agreements.

The consequence could be that we would have an escalation that would take place that would not only involve many lives, but I think it could consume the Middle East in a confrontation and a conflict that we would regret.

I want you and the people of Israel to know a few things that have not and will not change. The United States stands firmly with Israel, and we have a rock solid commitment to the security of Israel and to the security of its citizens.

I don't engage in hypotheticals.