Dunkin' Donuts has put its U.S. creative business up for review and aims to complete the process by the end of the first quarter of 2018. The review begins this month and could mean that Dunkin' will no longer run on Hill Holliday, which has handled creative for the brand since April 1998 and introduced the tagline "America Runs on Dunkin'" in 2006. Media, which has also been under Hill Holliday since 1998, will not be affected by this review. Hill Holliday was invited to participate in the invitation-only review, which is focused on national creative services, Dunkin' Donuts said. Interpublic Group of Cos' Hill Holliday deferred comment to Dunkin' Donuts. The longtime Dunkin' Donuts agency will compete in the review, according to people with knowledge of the matter.