A department for domestic concern was first considered by the 1st United States Congress in 1789, but those duties were placed in the Department of State. The idea of a separate domestic department continued to percolate for a half-century and was supported by presidents from James Madison to James Polk. The 1846–48 Mexican–American War gave the proposal new steam as the responsibilities of the federal government grew. Polk's Secretary of the Treasury, Robert J. Walker, became a vocal champion of creating the new department.