Property Rights of the U.S. Senate Judiciary Committee. Afterwards, he was a partner in the Washington, D.C., office of King & Spalding, where he headed the firm's appellate practice. He also served from 1998 to 2004 as an adjunct professor at the Georgetown University Law Center, where he taught a seminar on the separation of powers. Clement joined the United States Department of Justice in February 2001. Before his confirmation as Solicitor General, he served as Principal Deputy Solicitor General, and he became the acting Solicitor General on July 11, 2004, when Theodore Olson resigned. He has argued over 100 cases before the United States Supreme Court, including McConnell v. FEC, Tennessee v. Lane, Rumsfeld v. Padilla, United States v. Booker, Hamdi v. Rumsfeld, Rumsfeld v. FAIR, Hamdan v. Rumsfeld, Gonzales v. Raich, Gonzales v. Oregon, Gonzales v. Carhart, Hein v. Freedom From Religion Foundation, and Sekhar v. United States. He also argued many of the key cases in the lower courts involving challenges to the Bush administration's conduct of the war on terrorism. he had argued more cases before the Supreme Court since 2000 than any other lawyer. On August 27, 2007, President Bush named Clement as the future acting Attorney General of the United States, to take office upon the resignation of Alberto Gonzales, effective September 17, 2007. According to administration officials, Clement took that office at 12:01 AM September 17, 2007, and left office 24 hours later. On September 17, President Bush announced that Assistant Attorney General for the Civil Division, Peter Keisler would become acting Attorney General, pending a permanent appointment of a presidential nominee. Clement gave notice of his resignation on May 14, 2008, effective June 2, 2008, and returned to Georgetown University Law Center as a senior fellow. He had been mentioned as a possible Supreme Court nominee in a John McCain presidency, and was a coveted potential hire among D.C. legal firms, who reportedly vied to build a firm around his expertise in appellate matters. Evan Tager of Mayer Brown said: "Paul Clement is the Holy Grail of law firm recruiting... The buzz in the legal world about Clement is like the buzz in basketball when LeBron James was coming out of high school and turning pro. It will be interesting to see where the market will go." As of November 20, 2008, Clement re-joined King & Spalding as a partner in its