D. S. Margoliouth, The Caliphate: Yesterday, Today and Tomorrow
“ In order to be consistent, they will have to confine their choice to a powerful prince. To select the Wahhabi Sultan would be equivalent to identifying Islam with Wahhabism : but the difficulties of choosing any other Moslem potentate would seem to be enormous. If the functions of their Caliph were to be purely passive, that is, to be mentioned in public prayer he would certainly not be mentioned on the coins of any but his own State, it is improbable that the ruler of one Moslem State would allow this to be done in his dominions for the ruler of another State ”
