Although optimistic about the Iraqi elections he has expressed criticisms about upsurges in violences against Christians.
On May 7, 1997, he was appointed Archbishop of Erbil he was consecrated bishop on September 26, 1997, by Patriarch Mar Raphael I Bidawid, Archbishop André Sana, and Bishop Emmanuel Delly.
The spiritual leader of Iraq's Chaldean community, Emmanuel III Delly, called for Aziz's release in his 2007 Christmas message.
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Upon the retirement of Patriarch Mar Emmanuel III Delly, he served as locum tenens of the Patriarchate of Babylon of the Chaldeans until the election of Patriarch Louis Raphaël I Sako.