Mike serves as the fifth-ranking Republican on the Senate Finance Committee, giving Idaho an added voice in legislation that impacts their daily lives.

He serves on three Finance subcommittees- Ranking Member on the newly-created Subcommittee on Fiscal Responsibility and Economic Growth; member of the Subcommittee on Taxation and IRS Oversight; and member of the Subcommittee on International Trade, Customs and Global Competitiveness, on which he served as Ranking Member in the 111th Congress. Senator Crapo’s experience and leadership in promoting Idaho and U.S. exports of goods and services also earned him a 2009 Senate Republican Leadership appointment to the President’s Export Council.

At the beginning of his Senate service in 1999, Mike became a member of the Senate Banking, Housing and Urban Affairs Committee, and he is second in seniority among Republicans serving on the committee. He also maintains three subcommittee assignments. He is the Ranking Member on the Subcommittee on Securities, Insurance and Investment. Mike also serves on the Subcommittee on Housing, Transportation and Community Development. He is also a member of the Subcommittee on Financial Institutions and Consumer Protection, which has jurisdiction that includes banks, credit unions, other financial institutions and e-commerce.

Mike rejoined the Senate Environment and Public Works Committee in 2009, having served on it previously from 1999 to 2005. Mike is the Ranking Member on the Subcommittee on Superfund, Toxics and Environmental Health, which oversees issues of importance to North Idaho’s ongoing efforts to address environmental challenges related to mining operations. Mike is also a member of the Subcommittee on Transportation and Infrastructure, and he continues his service on the Subcommittee on Water and Wildlife, on which he previously served as Ranking Member. Mike is heavily involved in issues ranging from updating and strengthening the Endangered Species Act to clean water to salmon recovery. The Idaho National Lab is a major Eastern Idaho employer and center for national energy and defense research, and Mike utilizes his committee assignments and other opportunities to promote Idaho's essential energy research and development community and ensure Idahoans’ voices are heard in national energy policy and nuclear safety debates.

In 2003, Mike was selected to serve as a member of the Senate Budget Committee, which is responsible for crafting Congress’ annual budget plan, monitoring action on the budget and overseeing the operation of the Congressional Budget Office. Mike's fiscally-conservative principles lend a measure of responsible restraint to the pressures for greater spending by the federal government. Mike also served on the President’s National Commission on Fiscal Responsibility and Reform.

Rounding out his committee assignments for the 112th Congress, Mike serves on the Indian Affairs Committee. Idaho is home to five Native American Tribes, contributing to the richness of Idaho's history and the State's future. The Indian Affairs Committee is tasked with addressing the unique challenges of the Native peoples of our country, including health care access, education, economic development and land management, and considering any necessary legislative solutions.

From 2001 to 2008, Mike served as a member of the Senate Agriculture, Nutrition and Forestry Committee and advanced the needs of Idaho's agriculture and timber industries during the crafting of the 2002 Farm Bill and the 2008 Farm Bill. During his service on the committee, he served as Ranking Member of the Subcommittee on Rural Revitalization, Conservation, Forestry and Credit.

Mike also leads or serves on more than 27 caucuses. Mike is the founder and Co-Chair of the Senate Nuclear Cleanup Caucus. He also serves as Co-Chairman of the Western Water Caucus, the Congressional Sportsmen’s Caucus and the Senate Sweeteners Caucus. In early 2003, he founded the Congressional Chronic Obstructive Pulmonary Disease (COPD) Caucus, reinforcing his role as a champion of men’s and women’s health issues. Mike also serves on the Air Force Caucus, the Senate Biotechnology Caucus, Senate Missing, Exploited and Runaway Children Caucus, the Medical Technology Caucus, the Canada-U.S. Interparliamentary Group and others.

Mike currently serves as a Deputy Republican Whip, a position he has held for the last four Congresses. During Mike’s tenure in the House, he served on House Leadership as New Member Leader, Strategic Planning Leader and Deputy Whip for the Western Region.

Before being elected to the United States Senate in 1998, Mike served three terms as the 2nd District Representative for Idaho in the U.S. House of Representatives. Previously, he served in the Idaho State Senate from 1984 to 1992, and spent his final four years in the Idaho Legislature as Senate President Pro Tempore.

Prior to his service in Congress, Mike was a partner in the law firm of Holden, Kidwell, Hahn & Crapo. He is a member of the Idaho and California Bar Associations and the Bar of the U.S. Supreme Court. He received his Juris Doctorate cum laude from Harvard Law School in 1977, and he graduated summa cum laude from Brigham Young University in 1973 with a B.A. in political science. Following graduation from law school, he served a one-year clerkship with the 9th Circuit Court of Appeals. Mike and his wife, Susan, have five children and three grandchildren.