In March 2011, Rubio supported U.S. participation in the military campaign in Libya to oust Libyan leader Muammar Gaddafi. He urged that Senate leaders bring "a bi-partisan resolution to the Senate floor authorizing the president's decision to participate in allied military action in Libya". The administration decided that no congressional authorization was needed under the War Powers Resolution; Senator Joe Lieberman (I-CT) joined Rubio in writing an opinion piece for the "Wall Street Journal" in June 2011 again urging passage of such authorization. In October 2011, Rubio joined several other senators in pushing for continued engagement to "help Libya lay the foundation for sustainable security". Soon after Gadhafi was ousted, Rubio warned there was a serious threat posed by the spread of militias and weapons, and called for more U.S. involvement to counter that threat.