And then just quickly on the Nuclear Posture Review -- what is your response to criticism from some who are saying that it just makes the United States less safe by taking a big -- the possibility of nuclear deterrent off the table?

WHITEHOUSE: Press Briefings

Its nuclear posture includes, he believes, separation of warheads from launchers to minimise mistakes and a response time calibrated to avoid panic reaction.

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Rubio, who gave the GOP response to Obama's State of the Union address, displayed the party's conflicted posture on the issue that night.

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