WASHINGTON (AllPolitics) -- Thirteen Republicans on the House Judiciary Committee are serving as managers for the Senate trial. They will serve as prosecutors to make the case that President Bill Clinton committed perjury and obstructed justice in trying to conceal his illicit affair with former White House intern Monica Lewinsky.

Here are thumbnail profiles of the House managers:

Rep. Henry Hyde (R-Illinois) As chairman of the House Judiciary Committee since 1994, Hyde, 74, heads up one of the most contentious panels on Capitol Hill. The conservative Republican was first elected to Congress by his suburban Chicago district in 1974. On both sides of the aisle Hyde has a reputation for being intellectual and honest, though some Democrats on his committee have accused him of leading the proceedings as a "benevolent dictator." Most recently, Hyde himself was forced to acknowledge an adulterous affair that took place 30 years ago, after it was exposed in the media.

Rep. James Sensenbrenner (R-Wisconsin) Sensenbrenner, 55, is the second ranking majority member on the panel. First elected in 1978 to represent the suburbs of Milwaukee, he has risen to the most senior ranks of the House GOP. He has served as a chairman of the Judiciary Committee's panel on crime, and currently chairs the House Science Committee. Sensenbrenner is known as a stickler for ethics.

Rep. Bill McCollum (R-Florida) First elected to the House in 1980, the conservative McCollum, 54, represents most of Orlando and surrounding Orange County. In addition to his Judiciary committee duties, he serves as the chairman of the House Crime Subcommittee. Notably, McCollum led the Republican fight against the Brady bill, the Clinton Administration's gun control legislation.

Rep. George Gekas (R-Pennsylvania) Representing the Susquehanna Valley, including Harrisburg, since 1982, Gekas, 68, also chairs the Judiciary Committee's subcommittee on commercial and administrative law. He has a consistently conservative voting record and is best known in the House for his career-long crusade for the death penalty.

Rep. Charles Canady (R-Florida) A three-term congressman, Canady, 44, has quickly climbed the Republican ranks, also chairing Judiciary's Constitution subcommittee. The conservative Lakeland, Florida, native has a law degree from Yale University and is known in the chamber as a skilled legislator -- a strength he has most notably used to push for legislation banning a certain type of late-term abortion.

Rep. Steve Buyer (R-Indiana) Buyer, 40, was first elected to the House in 1992. A Desert Storm veteran, Buyer served as legal counsel for the 22nd Theater Army in the Persian Gulf operations. Military affairs is Buyer's focus, and he chairs the National Security subcommittee on military personnel.

Rep. Ed Bryant (R-Tennessee) A member of the "Class of 1994," Bryant, 50, represents suburban Nashville. A former U.S. attorney, Bryant has also served in the Army's Judge Advocate General Corps and taught law at West Point.

Rep. Steve Chabot (R-Ohio) Chabot, 45, has been voted in twice to represent a highly Democratic Ohio district that includes his hometown of Cincinnati. The onetime attorney is known for pushing the House to be more aggressive in its budget-cutting efforts. Thought to be one of the most vulnerable Republicans, Chabot successfully fought off a tough challenger in the November election.

Rep. Bob Barr (R-Georgia) The conservative Barr, 50, was first elected to Congress in 1994 and has been one of Clinton's most vocal critics ever since. In November 1997 he introduced a measure asking for an impeachment inquiry. A former U.S. attorney with a law degree from Georgetown University, Barr also worked previously as an analyst for the CIA.

Rep. Asa Hutchinson (R-Arkansas) A former U.S. attorney in Arkansas during Bill Clinton's tenure as governor, Hutchinson, 47, is in the uncomfortable position of personally knowing the president. He also has another close Clinton connection: in 1984 he prosecuted first brother Roger Clinton on federal drug charges. A freshman congressman, Hutchinson was elected in 1996 to replace his brother, Tim Hutchinson, when he gave up the seat to run for the Senate.

Rep. Christopher Cannon (R-Utah) An attorney turned congressman, Cannon, 48, represents Provo and part of Salt Lake City. The freshman lawmaker urges a path of fiscal conservatism and was an vocal advocate for reforming the Internal Revenue Service.

Rep. James Rogan (R-California) A former California assemblyman, Rogan has represented suburbs of Los Angeles at the base of the San Gabriel mountains since 1996. A lawyer with a degree from UCLA, Rogan, 41, served as a Los Angeles County deputy district attorney and a judge in the Glendale Judicial District.

Rep. Lindsey Graham (R-South Carolina) A lawyer and former judge advocate in the Air Force, Graham lives in Seneca, where he was born. Graham, 43, was elected in 1994. A conservative member of the "Class of 1994," he has a consistent voting record on items on the Republican agenda. He is also known for his role in the attempted coup to oust Speaker Newt Gingrich in 1997. Graham once said Clinton's policies made him "want to throw up," but he broke ranks with other Republicans in the committee to oppose the allegation that Clinton lied in the Paula Jones case.

CQ's Politics In America and The Associated Press contributed to this report.