ISIS is calling on Turkish Muslims to fight against "crusaders, atheists and tyrants," including their own President Recep Tayyip Erdogan.

The jihadist group has labeled Erdogan a traitor to Islam because he permits the United States to launch attacks against ISIS from Turkish air bases.

A new video published on Twitter yesterday (Monday) featured a Turkish-speaking member of ISIS accusing Erdogan of helping the US "bombard the people of Islam."

Almost 97 percent of Turkey's population is Muslim. The government is officially secular, but the line between mosque and state has been blurring slightly over recent years.