Out of office, Salam remained influential. In the wake of the Israeli invasion of Lebanon in 1982, he mediated between the United States envoy, Philip Habib and the PLO chairman Yasser Arafat, securing the removal of the Palestinian military presence in Lebanon. He opposed the election to the Presidency of Bachir Gemayel, but was reconciled to him after the election and began working with him on a number of reform proposals. When Gemayel was assassinated on 14 September of that year, without having taken office, Salam supported his brother, Amine Gemayel, for the Presidency and persuaded most Muslim National Assembly members to vote for him. Salam retired from politics in 1992.