Top U.S. military planners want to expand the limited advise-and-assist mission in Iraq and are talking to allied partner nations about potentially putting non-American troops on the ground to help support the fight against Islamic State group militants, according to several military officials.

The high-level discussion of expanding the support mission comes as the Iraqi army struggles to stop the advance of the militants, who are mounting large-scale attacks in northern and western Iraq. The result could be to push foreign military advisers to Iraqi units closer to the ground-level war-fighting operations, most likely in Anbar province.

Several U.S. Central Command officials familiar with the Iraq mission who spoke to reporters on condition of anonymity said U.S. forces are advising the Iraqi army at the division and headquarters levels. […]