Taftian theory (also "Whig" theory)^[1] is a political term in the United States referring to a strict constructionist view regarding presidential power and the United States Constitution, where a president's power is limited to those powers specifically enumerated by the Constitution.^[2][3]

This article relies largely or entirely on a single source. (December 2009)

Taftian Theory was coined after the governing style of the 27th president of the United States, William Howard Taft. Most presidents prior to Franklin D Roosevelt subscribed to this theory, as where more recent presidents subscribe to a stewardship theory.^[3]