He served as a member of the Knesset for the United Arab List between 2009 and 2019.

[1] He studied the history of the Middle East at the University of Haifa, gaining a BA, before working in education.

Between 1999 and 2001 he served as director general of Sakhnin's cultural center.

Between 2003 and 2005 he served on Sakhnin's city council, and prior to the 2009 elections was placed fourth on the joint United Arab List–Ta'al list.

Ghnnaim retired from national politics prior to the April 2019 elections, although he was given a symbolic 112th place on the joint United Arab List–Balad list for the elections.