From 2013 - U.S. 'backed plan to launch chemical weapon attack on Syria and blame it on Assad's regime'

Leaked emails from defense contractor refers to chemical weapons saying 'the idea is approved by Washington'

Obama issued warning to Syrian president Bashar al-Assad last month that use of chemical warfare was 'totally unacceptable'

Leaked emails have allegedly proved that the White House gave the green light to a chemical weapons attack in Syria that could be blamed on Assad's regime and in turn, spur international military action in the devastated country.

A report released on Monday contains an email exchange between two senior officials at British-based contractor Britam Defence where a scheme 'approved by Washington' is outlined explaining that Qatar would fund rebel forces in Syria to use chemical weapons.

Barack Obama made it clear to Syrian president Bashar al-Assad last month that the U.S. would not tolerate Syria using chemical weapons against its own people.