Mosab Hassan Yousef, the son of Hamas founder Sheikh Hassan Yousef, has defected from the group and served as an Israeli spy for a decade. He has expressed concerns about Hamas's goal to eliminate Jewish people and establish sharia law worldwide. Yousef revealed that Hamas is a religious movement focused on an unending religious war and wants to establish an Islamic state. He called for Israel to take out Hamas's leadership to overthrow the group. Yousef also stated that Hamas is more dangerous than ISIS.