We must never let down our guard, nor suffer another failure of imagination.
Today, we confront the possibility of terrorists bent on our destruction possessing a nuclear weapon or bomb-making materials.
Barack Obama will declare the cyber infrastructure a strategic asset, vital to national security and the global economy.
As president, he'll rebuild our alliances to take out terrorist networks.
Barack Obama will lead a global effort to secure all nuclear weapons materials at vulnerable sites within four years.
Barack Obama believes that we must urgently seek to reduce the risks from three potentially catastrophic threats: nuclear weapons, biologica...
Barack Obama understands our changing world.
It's time to send a clear message to the world: America seeks a world with no nuclear weapons.
That is an achievable goal if we pursue a comprehensive plan to press the Iraqis to stand up.
We cannot tolerate nuclear weapons in the hands of nations that support terror.
I opposed going to war in Iraq; Senator McCain was one of Washington's biggest supporters for war.