He was elected to the Newfoundland and Labrador House of Assembly in the 2015 provincial election,[1] representing the electoral district of Baie Verte-Green Bay as a member of the Liberal Party until resigning in 2024.

[2] In 2017, Warr was appointed Deputy Speaker and Chair of Committees of the House of Assembly serving until the 2019 election.

Following the Ball government's re-election, Warr has appointed to cabinet as Minister of Education and Early Childhood Development, making him the first new cabinet appointee following the 2019 Newfoundland and Labrador general election.

[7] On March 1, 2024, Warr announced his retirement from politics to spend more time with family and promptly resigned his seat in the legislature.

[8] The provincial by-election to replace him took place on May 27, 2024 electing PC Lin Paddock.