CAIRO – More than 200,000 people thronged Cairo’s central Tahrir Square, protesting against Egypt’s Islamist president Tuesday in an opposition show of strength, as the standoff over Mohammed Morsi’s assertion of near-absolute powers escalated into the biggest challenge yet to his and the Muslim Brotherhood’s rule.

The massive, flag-waving, chanting crowd in the iconic plaza rivaled the size of some of the large protests of last year’s uprising that drove autocrat Hosni Mubarak from office. The same chants used against Mubarak were now turned against Egypt’s first freely elected leader.

“The people want to bring down the regime,” and “erhal, erhal” – Arabic for “leave, leave,” rang across the square.