CAIRO (AP) — Protesters flooded Cairo’s Tahrir Square on Friday in the second giant rally this week, angrily vowing to bring down a draft constitution approved by allies of President Mohammed Morsi, as Egypt appeared headed toward a volatile confrontation between the opposition and ruling Islamists.

The protests have highlighted an increasingly cohesive opposition leadership of prominent liberal and secular politicians trying to direct public anger against Morsi and the Islamists — a contrast to the leaderless youth uprising last year which toppled autocrat Hosni Mubarak.