Career
When Washingtonian magazine polled congressional aides on the "best and worst" of Congress, Thomas was voted #2 for "brainiest", #3 for "workhorse", and #1 for "meanest" and overwhelmingly for "hottest temper" in the House. Thomas is known for being able to comprehend and communicate the intricacies of obscure legislative matters, studying testimony and research reports himself instead of relying on executive summaries from his aides. Thomas is also known for losing his temper when people are unprepared, earning a reputation for sharp interrogations. "He's revered, but he's also reviled to some degree", fellow representative Mark Foley told CQ Weekly.
Thomas voted against the Abandoned Shipwrecks Act of 1987. The Act asserts United States title to certain abandoned shipwrecks located on or embedded in submerged lands under state jurisdiction, and transfers title to the respective state, thereby empowering states to manage these cultural and historical resources more efficiently, with the goal of preventing treasure hunters and salvagers from damaging them. Despite him voting against hit, President Ronald Reagan signed it into law on April 28, 1988.
Thomas voted 'yea' on all four articles of impeachment against President Bill Clinton in 1998, including both perjury charges, obstruction of justice, and abuse of power.
Thomas was a key proponent of several of President George W. Bush's agenda items, including three major tax cut bills and the Medicare Prescription Drug, Improvement, and Modernization Act of 2003 (PL 108–173), and was also instrumental in the passage of the Balanced Budget Act of 1997.
On March 6, 2006, Thomas announced he would not seek reelection, retiring after 28 years in the House. A major influence on his decision was the internal GOP term limits that would require him to relinquish his Ways and Means chairmanship even if he were re-elected. Thomas endorsed a former aide, Assemblyman Kevin McCarthy, who was elected to replace him. Following McCarthy's vote to decertify the 2020 presidential election, Thomas said that McCarthy was a "hypocrite" and generally lambasted his behavior in regard to that election. Thomas has criticized McCarthy in several interviews since that time.
In 2007, after leaving the House, Thomas joined the American Enterprise Institute as a visiting fellow working on tax policy, trade policy, and health care policy. Thomas also joined law and lobbying firm Buchanan, Ingersoll & Rooney.
On September 8, 2016, Thomas was named to the Kern Community College District Board of Trustees for Area 1, filling the seat of Rick Wright. He did not run for reelection in 2018. He was replaced by Nan Gomez-Heitzeberg.