Turkey sentences man to life in prison for a 2017 nightclub attack, which killed 39 people in Istanbul.
As with the Hagia Sophia, the decision is seen as being geared to consolidate the conservative and religious support base of Erdogan's ruling party at a time when his popularity is under strain.
Regular religious services have not been held there since 1934 when modern Turkey's founding president Mustafa Kemal Atatürk signed an order converting the building into a museum. But a legal challenge claims the signature was forged.
This Friday, the disinfection process began in the places most frequented by tourists in the Turkish city of Istanbul.
Shopkeepers were in ankle-deep water trying to clear the water from their stores in Istanbul's Grand Bazaar.
Turkish President Tayyip Erdogan congratulated opposition candidate Ekrem Imamoglu on Sunday for winning Istanbul's re-run mayoral election according to unofficial results.