[2] He has served as the Treasurer of South Australia in the Malinauskas government since 2022.

Mullighan served as Minister for Transport and Infrastructure and Minister for Housing and Urban Development in the Weatherill Labor cabinet.

Mullighan entered cabinet in March 2014 and remained there until the March 2018 election when his party lost office.

He has held ministerial portfolio with responsibility for transport and infrastructure, and for housing and urban development.

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