It is evident from history, that this apprent concentration of the insignia of Caliphism round the Ottoman throne, had not been before wanted for the firm establishment of the Sultan; also, that it since has in no wise added the slightest circumstance of sacredness to his right or person.
Source: wiktionary
Of all the emotions, impatience is perhaps the easiest to manipulate; and there are all too many people in Iraq to drop a suggestion, here and there, of embezzlement, to hint that the ruling conservatives are following the old, rapacious road of the pashas, and that the time is near for a convulsion to remove all vestiges of caliphism and feudalism from the society of Iraq.
Source: wiktionary
As that campaign seeks to do, fighting ISIS means delegitimizing Caliphism at home and abroad.
Source: wiktionary