A member of the Republican Party, Cook also served on the Yucca Valley Town Council from 1998 to 2006 and represented the 65th district in the California State Assembly from 2006 to 2012.

[1] In the March 3, 2020 primary election, Cook defeated three opponents with an outright majority to avoid a November runoff and succeed Robert A. Lovingood, making him the new supervisor from San Bernardino County's 1st district.

[3] His actions in combat earned him many honors, including the Bronze Star and two Purple Hearts.

Cook taught courses on political violence and terrorism at University of California Riverside since 2002.

[14] Cook was endorsed by the California Off-Road Vehicle Association (CORVA) past presidents, the San Bernardino Sun, National Vietnam and Gulf War Veterans Coalition, the County Farm Bureau, state Assemblyman Steve Knight, state Senator Sharon Runner, and U.S.

His reason for voting for the repeal was to ensure that "every American has access to quality care to fit their budget.

"[18] In August 2017, he voted in favor of outlawing late term abortions, unless the woman was a victim of rape or incest or that her life was threatened.

[21] In the first session of the 115th United States Congress, Cook was ranked the 33rd most bipartisan member of the House by the Bipartisan Index, a metric published by The Lugar Center and Georgetown's McCourt School of Public Policy to assess congressional bipartisanship.

He supports legislation that "decreases premiums, makes it easier for employers to offer affordable healthcare options for their employees, and allows greater freedom for people to purchase a plan of their choice.