In March 2011, after heavy lobbying from senior officials including Secretary Hillary Clinton, President Obama authorized a bombing campaign in support of the jihadist insurgency fighting the government of Libyan leader Muammar Gaddafi. Backed by NATO firepower, the rebels toppled Gaddafi and gruesomely murdered him in October.

Buoyed by their quick success in Libya, the Obama administration set their sights on Damascus, by then a top regime change target in Washington. According to former NATO commander Wesley Clark, the Assad regime – a key ally of U.S. foes Iran, Hezbollah, and Russia – was marked for overthrow alongside Iraq in the immediate aftermath of 9/11. A leaked 2006 U.S. Embassy in Damascus cable assessed that Assad's "vulnerabilities" included "the potential threat to the regime from the increasing presence of transiting Islamist extremists," and detailed how the U.S. could "improve the likelihood of such opportunities arising."

The outbreak of the Syrian insurgency in March 2011, coupled with the fall of Gaddafi, offered the U.S. a historic opportunity to exploit Syria's vulnerabilities. While the Arab Spring sparked peaceful Syrian protests against the ruling Ba'ath party's cronyism and repression, it also triggered a largely Sunni, rural-based revolt that took a sectarian and violent turn. The U.S. and its allies, namely Qatar and Turkey, capitalized by tapping the massive arsenal of the newly ousted Libyan government.

"During the immediate aftermath of, and following the uncertainty caused by, the downfall of the [Gaddafi] regime in October 2011," the Defense Intelligence Agency reported the following year, "…weapons from the former Libya military stockpiles located in Benghazi, Libya were shipped from the port of Benghazi, Libya, to the ports of Banias and the Port of Borj Islam, Syria."

In his memoir, senior Obama aide Ben Rhodes acknowledged that al-Nusra "was probably the strongest fighting force within the opposition." It was also clear, he wrote, that U.S.-backed insurgent groups were "fighting side by side with al-Nusra." For this reason, Rhodes recalled, he argued against the State Department's December 2012 designation of al-Nusra as a foreign terrorist organization. This move "would alienate the same people we want to help." (Asked about wanting to help an Al Qaeda-dominated insurgency, Rhodes did not respond).

Despite being privately aware of Nusra's dominance, Obama administration officials continued to publicly insist that the U.S. was only supporting Syria's "moderate opposition," as then-Deputy National Security Adviser Antony Blinken described it in September 2014.

But speaking to a Harvard audience days later, then-Vice President Biden blurted out the concealed reality. In the Syrian insurgency, "there was no moderate middle," Biden admitted. Instead, U.S. "allies" in Syria "poured hundreds of millions of dollars and thousands of tons of weapons into anyone who would fight against Assad." Those weapons were supplied, Biden said, to "al-Nusra, and Al-Qaeda and the extremist elements of jihadis coming from other parts of the world."