Mansour began his career at the Foreign Ministry in 1974. In September 2012, he and a Lebanese judge went to Mauritania to search for the possibility of questioning the former Libyan intelligence chief
Abdullah Senussi, who served during the
Muammar Gaddafi's era about the fate of
Imam Musa Sadr.
Gebran Bassil replaced Mansour as foreign minister in February 2014.
Views and alliances Mansour has a pro-Syrian stance and is close to the Nabih Berri.{{cite news|title=Riyadh renews commitment to Lebanon|url=http://www.thefreelibrary.com/Riyadh+renews+commitment+to+Lebanon.-a0321768823|access-date=26 March 2013|newspaper=The Daily Star ==Personal life==