Former Iraqi President Barham Salih is on track to become the next head of the U.N. refugee agency, according to a letter from U.N. Secretary-General António Guterres shared with The Associated Press on Friday.

Salih, 65, is set to succeed longtime UNHCR veteran Filippo Grandi as the U.N. High Commissioner for Refugees. Grandi took office on Jan. 1, 2016, and his second five-year term expires on Dec. 31. He had succeeded Guterres in the post.