JERUSALEM (AP) — The White House could announce today to send several hundred more troops to Iraq to expand training of Iraqi forces in Anbar province.

That would increase the number of U.S. training sites in Iraq from four to five and enable a larger number of Iraqis — mostly Sunni tribal volunteers, in this case — to join the fight against the Islamic militant group.

U.S. officials have said repeatedly that getting the Sunnis more deeply involved in the war is critical to ousting IS from Anbar.