The military and the MB are the two principal centers of power in post-Mubarak Egypt. The transition from a single-party to a multi-party system — triggered by former Egyptian President Hosni Mubarak's downfall — centers on the struggle between these two players. Since the MB emerged as the largest bloc in parliament , the presidential election (and the drafting of a new constitution, which is stalled because of a dispute over the composition of the constituent assembly) is important for the SCAF in its struggle to retain power. From the SCAF's perspective, it is essential that the MB not control both the legislative and executive branches of government. In fact, the SCAF hopes to use the presidency to keep the MB-dominated parliament in check. The council achieved a partial victory when it engineered the disqualification of the MB's star candidate, Khairat el-Shater .