Telling Hasan that he had read the document himself, Flynn said that it was among a range of intelligence being circulated throughout the US intelligence community that had led him to attempt to dissuade the White House from supporting these groups, albeit without success.

Despite this, Flynn’s account shows that the US commitment to supporting the Syrian insurgency against Bashir al-Assad led the US to deliberately support the very al-Qaeda affiliated forces it had previously fought in Iraq.

The US anti-Assad strategy in Syria, in other words, bolstered the very al-Qaeda factions the US had fought in Iraq, by using the Gulf states and Turkey to finance the same groups in Syria. As a direct consequence, the secular and moderate elements of the Free Syrian Army were increasingly supplanted by virulent Islamist extremists backed by US allies.

Read moreOfficials Admit ISIS, Like Al-Qaeda, Was A Creation Of U.S. Foreign Policy