They probably did not want to admit the fact because of a constitutional clause which calls for the removal of the office holder, once declared unfit by a medical board if called by Cabinet. 
Huenda hawakutaka kukiri ukweli kwa sababu katiba inataka kuondolewa madarakani kwa kiongozi, ikithibitishwa na baraza la madaktari kwa ombi la baraza la mawaziri, kwamba afya yake ina matatizo.