sentences:  He was selected to represent the United States Congress at the Interparliamentary Union in London in 1960, and in Tokyo in 1961.McMillan was elected as a Democrat to the Seventy-sixth and to the sixteen succeeding Congresses, serving from January 3, 1939 to January 3, 1973.He was chairman of the Committee on the District of Columbia from 1945 to 1947, from 1949 to 1953, and from 1955 to 1973.