Democrat Barack Obama warned Wednesday about the danger of "fighting the last war" as he pledged to focus on emerging nuclear, biological and cyber threats if elected president.
Two goals of his administration would be to secure all loose nuclear material during his first term and to rid the world of nuclear weapons, Obama told an audience before a roundtable discussion at Purdue University.

Obama said adhering to nonproliferation treaties would put pressure on nations such as North Korea and Iran. North Korea has tested a nuclear weapon and Iran has an energy program the Bush administration warns could be a precursor to nuclear weapon development.

"As long as nuclear weapons exist, we'll retain a strong deterrent. But we will make the goal of eliminating all nuclear weapons a central element in our nuclear policy," Obama said.

He added, "The danger ... is that we are constantly fighting the last war, responding to the threats that have come to fruition, instead of staying one step ahead of the threats of the 21st century."