Egypt's new interim president Adli Mansour is due to be sworn in. It comes hours after the army ousted President Mohammed Morsi and put him under house arrest.
The Islamist president has called the army intervention a military coup. There will now have to be new elections.
Reporter Sam Kiley is in Cairo and says all is not lost for the Muslim Brotherhood party.
"So long as they recover their political mojo, they could probably win an election even they didn't necessarily carry a Presidency" he said.
"That is something that will be being communicated to them by the international community, that you're still in the game" he added.