Egypt's Coptic Church quit a committee tasked with drafting the country's new constitution.
The Coptic Church called its participation in the committee "futile" after only six Christians were selected to take part.
The 100-member panel is dominated by Islamists, raising concerns about the content of Egypt's new constitution.
The Muslim Brotherhood's Freedom and Justice Party has staked out a clear majority on the panel.
Copts account for a majority of Egypt's 10 million Christian minority.