From Asia News:
A little-known independent deputy from the Burdur district, Hami Yildirim, has filed a motion in the Turkish parliament to transform the Istanbul Hagia Sophia museum into a mosque. The Hagia Sophia is known to all as an architectural masterpiece, a symbol of united Christendom, built by Emperor Justinian in 537 AD.
The news was broken by Haber Turk and so far has not been denied. On the contrary, there are other worrying signs: a few days ago, Prime Minister Recep Tayyip Erdogan expressed his desire to celebrate an Islamic function in Santa Sofia on 29 May, the day that commemorates the conquest of Constantinople by Mehmet II.
The motion of the unknown Yildirim will have to go through a series of stages: approval in parliament, where Erdogan’s party, the AKP, holds the majority (325 seats out of 550); publication in the Official Gazette; entry into force following the ratification of the Premier.
Also see coverage from various Turkish sources (you can use Google translate to get the gist of the items): Haber Turk, Sabah, Milliyet.