Robert Grenier is a former CIA station chief for Afghanistan and Pakistan, and the man who was tapped by the CIA and White House to direct the first America-Afghan war following the attacks of 9/11. In his new book, 88 Days to Kandahar, Grenier discusses how he forged alliances with warlords and Pakistani intelligence operatives to execute a campaign that defeated the Taliban in Afghanistan's southern region.

Following his work in Pakistan and Afghanistan, Grenier returned to Washington, DC, and was tasked with overseeing the CIA's intelligence operations and analysis in Iraq prior to the 2003 US invasion.

VICE News visited Grenier at his home in Virginia to talk about America's longest war, the CIA's use of "enhanced interrogation techniques," and the rise of the Islamic State.

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