CAIRO (AP) — Egypt’s highest court has joined a judicial rebellion against President Mohammed Morsi by declaring an open-ended strike on the day it was supposed to rule on the legitimacy of two key assemblies controlled by allies of the Islamist leader.

The strike announced Sunday by the Supreme Constitutional Court and opposition plans to march on the presidential palace on Tuesday take the country’s latest political crisis to a level not seen in the nearly two years of turmoil since Hosni Mubarak’s ouster in a popular uprising.