McGuire, Brian T.

A trusted, longtime advisor on public policy and political strategy, Brian McGuire leverages his senior level executive and legislative branch experience for clients. Brian most recently served as the Department of the Treasury’s assistant secretary for Legislative Affairs and, prior to that role, served as a longtime senior aide to Senate Majority Leader Mitch McConnell (R-KY). Brian understands the people, policies, political nuances and messages that drive results in many industries, from financial services and energy to infrastructure and health care.

At Treasury, Brian advised Sec. Steven Mnuchin and other departmental offices and bureaus on all legislative matters, first as counselor to the secretary and most recently as assistant secretary for Legislative Affairs. He was nominated for the latter position by President Trump and confirmed by the Senate. During his tenure at Treasury, Brian guided the confirmation of numerous senior Treasury officials. On the policy front, Brian helped implement the Tax Cuts and Jobs Act of 2017, successfully pushed for Senate approval and ratification of five long-stalled treaty protocols, provided consultation on key sanctions activities, oversaw the rollout of new regulations under the Foreign Investment Risk Review Modernization Act, and helped manage Treasury’s congressional consultation on Phase II of the administration’s coronavirus response, the Families First Coronavirus Response Act. He also managed hearing preparation for 12 Cabinet-level congressional hearings.  

Prior to Treasury, Brian served as chief of staff to Sen. McConnell, where he was responsible for guiding home-state priorities and advising on strategic communications, politics and policy. He also served for eight years in a variety of senior communications roles in Sen. McConnell’s Senate Leadership Office. He has advised several winning U.S. Senate campaigns, and worked as a consultant for the National Republican Senatorial Committee. 

During the Bush administration, Brian served as chief speechwriter for the secretary of the Department of Housing and Urban Development. He has appeared as a political commentator on Fox, CNN, PBS, NPR, and MSNBC, and his writing has appeared in numerous publications, including The Wall Street Journal, The Washington Post, Time, USA Today, and Politico.

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  • M.A., Columbia University Graduate School of Journalism
  • B.A., St. John’s College
  • Named to POLITICO Playbook’s Power List of “30 Most Powerful People and Groups in Trump’s Washington” (January 2017)