The shared interests that have driven the Muslim Brotherhood of Egypt and the country's military together over the past year remain, but large, sustained protests could strain that relationship and force the military to reassess its options. Anti-government protests planned for June 30 by a recently formed opposition movement called Tamarod represent a particularly potent threat to the political legitimacy of President Mohammed Morsi's regime. The Tamarod movement's ultimate intent with the upcoming demonstrations is to instigate enough unrest on Egypt's streets to force the military to intervene — an unlikely result. However, even if the protests fizzle and fall short of this goal, Tamarod has given a voice to the growing, visceral dissatisfaction with Morsi's government in Egypt — one that could undermine the Muslim Brotherhood's ability to govern and its performance in future elections.