In 1784, Smith served as a member of the South Carolina privy council. During the Washington administration, Smith accompanied Washington on tours of Rhode Island and the Southern states. Smith was subsequently reelected to the
Second Congress and
Third Congress. Smith later joined the
Federalist Party and was reelected to the
Fourth and
Fifth Congress under that ticket. In the Third Congress, Smith served as chair of the
Committee on Elections. In the Fourth and Fifth Congresses, Smith served as chair of the
Committee on Ways and Means. As chair of the
Committee on Ways and Means, Smith acted as a
Federalist floor leader and was known as a close collaborator and House spokesman for
Treasury Secretary Alexander Hamilton. On July 10, 1797, Smith resigned from Congress to serve as
United States Ambassador to Portugal. He held the position until September 9, 1801, when he was recalled and took a leave of absence. Smith returned to Charleston and ran for Congress again in 1804, 1806, and 1808, but lost all of those elections to the
Democratic-Republican Party candidate
Robert Marion. In 1808, Smith was commissioned as a lieutenant in the South Carolina Militia. That same year, Smith was elected to the South Carolina House of Representatives. ==Later life and death==