Liberals and Islamists in Egypt announced a temporary agreement Monday on a power-sharing plan that would install a Muslim Brotherhood leader as speaker of the country’s newly elected parliament.

The agreement among six political parties all but guarantees that the Muslim Brotherhood’s Freedom and Justice Party will lead Egypt’s first post-Hosni Mubarak elected body, with the Islamist party expected to control as many as half of the parliamentary seats.

Under the power-sharing agreement, the ultraconservative Salafist Nour party and the Wafd Party would also claim top positions, with representatives serving as deputy speakers, the parties announced during a press conference at the Freedom and Justice Party headquarters on Monday.