Known as the 'ghost', Baghdadi is an Iraqi scholar in Islamic studies, who founded ISIS in 2010. He proclaimed himself the Caliph after ISIS captured Mosul in 2014. Baghdadi's leadership has been key in allowing the rise of ISIS in a short time.
Russian military indicated that Baghdadi had been killed in an air strike in Raqqa, Syria in June. It was later confirmed by the ISIS itself. US Defense Secretary James Mattis recently said that he believes Baghdadi is still alive, questioning the credibility of these reports.
Seeking an end to illegal leaks, Trump tweeted, "A new INTELLIGENCE LEAK from the Amazon Washington Post, this time against AG Jeff Sessions. These illegal leaks, like Comey's, must stop!", referring to a Washington Post report based on intelligence excerpts.