Hank Crumpton, a former deputy director of the CIA’s Counter-Terrorism Center who led the U.S. response to 9/11, told “60 Minutes” that China, in particular, is operating a robust shadow network under the noses of American intelligence agents. Click below to find out more.

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“If you look at the threat that is imposed upon our nation every day, some of the major nation states — China in particular — [have] very sophisticated intelligence operations, very aggressive operations against the U.S.,” Crumpton told correspondent Lara Logan.

“I would hazard to guess there are more foreign intelligence officers inside the U.S. working against U.S. interests now than even at the height of the Cold War,” he said. “It’s a critical issue.”

In the wide-raging interview that aired Sunday, Crumpton, 55, touched on his 24 years in the CIA, including the time spent hunting Osama bin Laden before and after 9/11 and the CIA-led mission to topple the Taliban in Afghanistan.

During his time in Afghanistan and North Korea, Crumpton said he discovered America’s enemies had at least one thing in common: They loved porn.

“I never met a North Korean that did not like pornography,” Crumpton said, adding that it was common for CIA spooks to trade X-rated material for intel on Kim Jong Il’s secretive regime.