Eissa said his decision to quit the race, leaving 12 candidates still in contention, came from a desire "not to split the votes" of like-minded candidates, the official MENA news agency said.
"I have the honour to be joining the next presidential team as a supporter and I will urge my supporters" to do the same. "We have similar ideas," Eissa said.
Egypt's landmark presidential election, set for May 23-24, comes 15 months after mass nationwide protests ousted Mubarak and left the military in charge of the country.
Mussa, a leading contender in the race, faces competition from Ahmed Shafiq, who served as Mubarak's last prime minister, as well as from Muslim Brotherhood candidate Mohammed Mursi and a moderate Islamist, Abdel Moneim Abul Fotouh.
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"I have the honour to be joining the next presidential team as a supporter and I will urge my supporters" to do the same. "We have similar ideas," Eissa said.
Egypt's landmark presidential election, set for May 23-24, comes 15 months after mass nationwide protests ousted Mubarak and left the military in charge of the country.
Mussa, a leading contender in the race, faces competition from Ahmed Shafiq, who served as Mubarak's last prime minister, as well as from Muslim Brotherhood candidate Mohammed Mursi and a moderate Islamist, Abdel Moneim Abul Fotouh.
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