Stewart failed to get pre-selection as a
Nationalist candidate for the
Australian House of Representatives seat of
Martin at the
1929 election and ran unsuccessfully for the state seat of
Concord at the 1930 election. He won the federal seat of
Parramatta for the
United Australia Party at the
1931 election and held it until his retirement before the
1946 election. He supported a shorter work week to reduce unemployment during the
Great Depression and programs to improve social conditions such as national insurance and workers' housing schemes. Stewart was appointed
Minister for Commerce from October 1932 had responsibility for trade policy. In November 1934, he stood down to allow the
Country Party to be brought into the
ministry, with
Earle Page becoming Minister for Commerce. He refused
Joseph Lyons's offer of a junior ministry and instead became parliamentary under-secretary for employment, but resigned this position in February 1936 so that he could concentrate on his private scheme to improve social conditions. He was knighted in 1935. After the
1937 election, under pressure from Stewart, Lyons announced
a limited national insurance scheme, but Stewart refused a position in
Cabinet. Stewart was appointed as
Minister for Health and
Minister for Social Services in
Robert Menzies'
ministry in April 1939 and continued to press for the implementation of a national insurance scheme. In November 1939, with the outbreak of World War II, he was given the additional portfolio of
Minister for the Navy and in January 1940, he became in addition
Minister for Supply and Development on
Richard Casey's appointment as Ambassador to the United States. This portfolio was responsible for procuring supplies for the military. In March 1940, he lost the portfolios of health and the navy, but retained social services and supply and development in the
second Menzies Ministry. He was criticised over his performance in supplying the military, despite such ingenuity as finding and refurbishing 15,000 World War I uniforms and he lost the supply portfolio from October 1940 in the
third Menzies Ministry, but was appointed
Minister for External Affairs, retained social services and regained health. He held the three portfolios until the fall of the
Fadden government in October 1941. In opposition he served as chairman of the Joint Committee on Social Security in 1943 and 1944. ==Personal life==