John Steenhuisen is a member of the Democratic Alliance (DA), South Africa’s leading opposition party. He served as the DA’s federal leader (2019–26) and as the chief whip of the official opposition in the National Assembly (2014–19).
Steenhuisen first joined the Democratic Party (DP) during the 1990s. In 2000 the DP joined with two other parties to form the DA, with which Steenhuisen was active.