"I suspect that Donald Trump is going to be very tough with those countries that don't spend at least 2 percent of their gross domestic product on defense. He will ask them why should we allow a free-ride policy."

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Russia is modernizing its nuclear systems. They're moving toward more effective tactical nuclear systems. They're moving toward delivery systems designed to evade anti-ballistic missile defenses. The Russians are investing, by the way, in robotic weapons, including a potential robotic tank. Their investment in new technology, I suspect, outweighs all of the European defense research and development spending combined.

— Newt Gingrich