al-Qaida, isis-isil Al-Qaeda Leader Ayman Al-Zawahiri: Al-Baghdadi Rejected Our Proposal To Join Forces Against The U.S. March 21, 2018 Historyscoper https://www.memri.org/jttm/al-qaeda-leader-ayman-al-zawahiri-al-baghdadi-rejected-our-proposal-join-forces-against-us