Group leading millions seeking Morsi ouster call for leader to quit by Tuesday threatening "civil disobedience".
Protesters seeking to force Egyptian President Mohamed Morsi from office are gearing up for a second day of action, after large crowds thronged the streets of Cairo and cities around the country and marched on the presidential palace.
Some preparing for rallies on Monday spent the night in dozens of tents pitched at the capital's central Tahrir Square and the palace, positions organisers say they will hold until Morsi resigns.
