CAIRO (AP) — The Egyptian president’s Muslim Brotherhood has called on supporters to rally outside the presidential palace for a rival demonstration countering opponents of the Islamist leader.

Wednesday’s rallying call sets up a potential clash between the two sides. About 300 opposition supporters are staging a sit-in outside the Itihadiya palace a day after tens of thousands surrounded the complex.

The opposition is seeking to build on momentum to press demands that President Mohammed Morsi rescind decrees giving him nearly unrestricted powers and shelve a disputed draft constitution.

The call for the rally has been posted on the official Facebook page of the Brotherhood’s party, saying it’s a bid to underscore Morsi’s legitimacy as an elected leader.