CAIRO (AP) — The head of the Arab League urged its members Sunday to confront Islamic State extremists “militarily and politically,” issuing an apparent call to arms as President Barack Obama prepares to go to lawmakers and the American public with his own plan to stop the militants.

Backing from the 22-country Arab League could provide crucial support across the Middle East for Obama’s effort to assemble an international coalition against the Islamic State, the marauding group that has conquered a swath of Iraq and Syria and committed beheadings and mass killings to sow terror.