Now we head overseas to egypt for so long a critical american ally in the middle east and with the iconic pyramids, a t destination for millions of us. Tonight a cal dron of unrest and for the next 24... See More
Now we head overseas to egypt for so long a critical american ally in the middle east and with the iconic pyramids, a t destination for millions of us. Tonight a cal dron of unrest and for the next 24 hours the clock is ticking down to a deadline. Alex marquardt is there. Reporter: In cairo's tahrir square the tension has risen and the energy has grown. As the seconds tick away to the ultimatum deadline. Military threatening to intervene tomorrow if the president doesn't mean the people's demand. Tonight morsi admitted he has made mistakes but was elected fairly and will not step down. We met a woman who launched the protests. In the new constitution there's no role for women she said. In the morsi era women have no place. The anger is driven by fear that the muslim brotherhood wants to control egypt as well as that decimated economy. Look at egypt's famous pyramids filled with american tourist before the revolution. Since then they've been practically empty. Egypt's time us nile river used to be packed with these boats called falucas. The last american this man had on his fa luke ka was a month ago. How much money did you make this week? Ten pounds. Less than $2. He told us he's going to join the masses on tahrir square. Alexmarquardt, abc news, cairo.
This transcript has been automatically generated and may not be 100% accurate.