The vast western region of Darfur was convulsed by bloody fighting in 2003. It killed 300,000 people and displaced 2.5 million, according to the United Nations.
Bashir, who is currently in custody in Khartoum, is wanted by the International Criminal Court for alleged genocide and war crimes in Darfur perpetrated more than a decade ago.
Conflict erupted in Darfur in 2003, when African minority rebels rose up against Bashir's Arab-dominated government, which they accused of marginalising the region.
Many Darfuri residents say UNAMID has not effectively protected them, but they fear its withdrawal will leave them more vulnerable and have staged protests in recent weeks.