"What we’re doing now is, in the process of building the force that will go to Mosul eventually," Warren said. "We think it will be roughly ten brigades with anywhere from about 2,000 sometimes 3,000, it depends on the brigade how many people are in the brigade."
Warren noted the coalition has trained about 20,000 Iraqi security forces, including police and Sunni tribal fighters, but wanted to provide additional training even to those they had already been trained.
Last June, Daesh took hold of Mosul, Iraq's second largest city, and also managed to seize the largest dam in Iraq, which is now at risk of collapsing and causing a major humanitarian catastrophe.
Daesh is a designated terrorist group that is outlawed in the United States and Russia, among many other countries. The US-led international coalition against Daesh has been launching airstrikes against the terror group’s positions in Iraq since August 2014.