In 1999 he founded the bipartisan Congressional Immigration Reform Caucus. By the end of the 109th Congress it amassed 104 members. Under his leadership the caucus was instrumental in passing the The Border Protection, Anti-terrorism, and Illegal Immigration Control Act through the House of Representatives in 2005. The caucus also blocked the Kennedy-McCain amnesty provision from passing through the House in 2006. Tom has written about the dangers of illegal immigration in his 2006 book, In Mortal Danger: The Battle for America's border and Security.
Tom is a member of both the House International Relations and Resources Committees. As a member of the International Relations Subcommittee on Africa, Congressman Tancredo authored the Sudan Peace Act which was signed in 2002 by President George W. Bush.
Tom and his wife Jackie have been married since 1977. They have two children and five grandchildren.
When Tom is not in Washington, you can usually find him either trap, skeet, and clay pigeon shooting, or with his grandsons, building trains, racing cars, riding bikes, or playing ball.