Gamal Abdel Nasser
Following Syria's secession, Nasser grew concerned with Amer's inability to train and modernize the army, and with the state within a state Amer had created in the military command and intelligence apparatus. In late 1961, Nasser established the Presidential Council and decreed it the authority to approve all senior military appointments, instead of leaving this responsibility solely to Amer. Moreover, he instructed that the primary criterion for promotion should be merit and not personal loyalties. Nasser retracted the initiative after Amer's allies in the officers corps threatened to mobilize against him.

Q: Why did Nasser abandon the Presidential Council?
Amer's allies in the officers corps threatened to mobilize against him