President Obama is to deliver a statement live form the White House following a meeting with his national security team.
Mr Obama is expected to announce that he is deploying 100 Green Berets to Iraq to help train and advise Iraqi forces.
The Foreign Secretary has been clear on the threat of Isis, but he has ruled out the prospect of any UK military involvement in the crisis.
Iraq’s foreign minister, Hoshyar Zebari, is a natural diplomat. Polite, immaculately dressed, and blessed with a great memory.
Isis has paraded military equipment in Mosul it captured from when the Iraqi army fled in what some see as a "nightmare scenario."