sentences:  As the governor of Khurasan, Amr now asserted the rights formally held by the Tahirids to nominate his representative for the offices in the West; his choice fell on 'Ubadydallah.Amr also used his influence to have Muhammad arrested for allegedly supporting Khujistani, although there was little evidence to support this.Muhammad regained caliphal favor when the peace between the caliphate and the Saffarids fell out in around 884.