BEIRUT, Lebanon (CNN) — Under pressure from the United Nations and opposition politicians, Lebanon’s security chief said he was putting his fate in the hands of Prime Minister Najib Mikati.Friday’s move was a step short of resignation and comes ahead of a U.N. authorized investigation into the assassination of former Prime Minister Rafik Hariri.Jamil Sayyed, head of general security in Lebanon, said he was putting himself at the disposal of the prime minister, leaving it up to Mikati to decide his fate. The Associated Press reported that Ali Hajj, the country’s top police commander, also has stepped aside and placed himself at Mikati’s disposal. Hajj told AP he was taking the step “to facilitate the work of the international investigation commission until the end of its mission.” He said it was up to the Cabinet to decide whether to reinstate him later.