He represented the eighth (previously designated the fifth) congressional district, comprising the southeastern part of Arizona with Tucson as the main population area.
While in Congress, Mr. Kolbe served for 20 years on the Appropriations Committee, responsible for deciding the allocation of the budget and the terms for spending appropriated funds. He was Chairman of the Treasury, Post Office and Related Agencies Subcommittee for four years, and for the last six years in Congress, he chaired the Foreign Operations, Export Financing and Related Agencies Subcommittee.