The leader of the Al-Qaeda terrorist group, Ayman al-Zawahiri, on Wednesday said that rival group Islamic State (ISIS) and its leader Abu Bakr al-Baghdadi are “illegitimate”, but also said his followers would join them in fighting the Western-led coalition in Iraq and Syria if possible.
Speaking in an audiotape on the internet and quoted by the Reuters news agency, Zawahiri said, "We don't recognize this caliphate."