The situation in Iraq presents a security crisis for US President Barack Obama and his advisers.
As US airstrikes may be needed to halt the ISIS militants, the President is facing accusations of abandoning Iraq after the removal of US military from Baghdad in 2011.
ITV News Washington Correspondent Robert Moore reports:
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."