CAIRO - Tens of thousands of Islamists demonstrated in Cairo on Saturday in support of President Mohamed Morsi, who is racing through a constitution to try to defuse opposition fury over his newly expanded powers.

"The people want the implementation of God's law," chanted at least 50,000 flag-waving demonstrators, many of them bussed in from the countryside to pack streets near Cairo University.

Morsi was expected later in the day to set a date for a referendum on the constitution hastily approved by an Islamist-dominated drafting assembly on Friday after a 19-hour session.

"We will certainly present the constitution to the president tonight," Mohamed al-Beltagy, a Muslim Brotherhood leader and a member of the constituent assembly, told Reuters.

The presidency said the handover would take place at 7 p.m. (1700 GMT) at a convention center in Cairo.

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