Move is aimed to have body's charter altered to grant sitting heads of state immunity from prosecution.
Prosecutions of Kenya's president and his deputy causing strain.
Kenyan leader's trial at ICC could now be pushed to next year.
Kenya laying groundwork to allow Uhuru Kenyatta to avoid I.C.C.
The militant group behind the takeover of a Nairobi mall claimed Wednesday that Kenyan government assault team carried out "a demolition" of the building, burying 137 hostages in rubble.
Major assault began Sunday to retake upscale shopping center.
Announcement from Uganda pol comes during trial of Kenya's deputy president.
William Ruto will face charges of crimes against humanity at ICC.
Move to withdraw from Rome Statute comes before leaders face ICC trial.
Election commission chairman refused to take an oath before parliament, testify.