Following the parliamentary resignation of
Bernard Finnigan on 12 November 2015, Malinauskas filled the
Legislative Council casual vacancy in a
joint sitting of the
Parliament of South Australia on
1 December. Premier
Jay Weatherill indicated that Malinauskas could enter the
Cabinet of South Australia in an early 2016 ministerial reshuffle, with reports of media speculation and internal party talk suggesting Malinauskas could potentially become the next Labor premier of South Australia, entering the
House of Assembly through preselection as the next Labor candidate in Labor's safest lower house seat of
Croydon with claims that incumbent
Michael Atkinson "has long been willing to vacate his seat to Malinauskas if he ever wanted it". Atkinson announced in February 2017 that he would be retiring from parliament as of the
2018 election. Malinauskas confirmed he would be nominating for preselection. Malinauskas served in the cabinet in the
Weatherill ministry between January 2016 and March 2018, holding, at various times, ministerial portfolios with responsibility for police (2016–2017), correctional services (2016–2017), emergency services (2016–2017), road safety (2016–2017), health (2017–2018), and mental health and substance abuse (2017–2018). Malinauskas won the seat of
Croydon at the
2018 election.
Leader of the Opposition (2018–2022) Following the resignation of
Jay Weatherill after the
2018 election, a caucus meeting on 9 April 2018 elected Malinauskas as
Labor Leader. He consequently became
Leader of the Opposition, with former Education Minister
Susan Close as his
deputy. In April 2021, former Labor MP
Annabel Digance and her husband were arrested and charged with attempting to blackmail Malinauskas. Police alleged that the couple had threatened to make accusations against Malinauskas if he did not orchestrate Digance's return to politics by preselection for a safe seat or appointment to the Legislative Council or the Senate. The charges against the Digances were withdrawn in April 2023.
Premier of South Australia (2022–present) In March 2022, Malinauskas led the party to victory at the
state election, winning 26 seats on an eight-seat swing party after making healthcare a theme during the election. He was sworn in as premier of South Australia on 21 March 2022. In May 2022, the government ended South Australia's
state of emergency for the
COVID-19 pandemic in South Australia, after 793 consecutive days. Soon after the election, Malinauskas pledged to implement a state-based
First Nations Voice to Parliament, as well as restarting
treaty talks and greater investment in areas affecting
Aboriginal South Australians. In July 2022
Dale Agius was appointed as the state's first Commissioner for First Nations Voice, with the role commencing in August. The South Australian state-based Voice was delayed until 2024, because of the
2023 Australian Indigenous Voice referendum.
Elections took place on 16 March 2024, with Maher describing it as a successful election despite the low turnout, saying that it would take time to build awareness and engagement. In April 2024, after a public outcry following the announcement that a developer was going to gut the historic
Crown & Anchor pub, famed for its live music, and build high-rise student housing above its facade, Malinauskas intervened, placing the building under provisional state heritage-listing to protect it until its heritage values could be fully assessed, a decision supported by opposition leader
David Speirs. Also in April 2024, Malinauskas intervened to launch a review panel to examine a plan to restructure the
South Australian Museum, which had included cutting out 27 research positions. He said that both the previous government and his government had made cuts to the museum's budget. The Malinauskas government introduced a range of initiatives, including educational reforms. One of these is introducing compulsory civics subject into the school curriculum. It has also introduced a number of 24/7 pharmacies, and continued efforts to reduce ambulance ramping through investments in increased bed capacity and building
ambulance stations. On 8 September 2024, the Malinauskas government proposed a new law, in the
Children (Social Media Safety) Bill 2024, to ban children under 14 from accessing social media, and to require parental consent for children aged 14 and 15. The bill followed a review by the former
Chief Justice of the High Court,
Robert French. Shortly afterwards, Malinauskas supported the
federal Labor government's
age verification system for social media use. On 27 November 2024, the
Electoral (Accountability and Integrity) Amendment Act 2024 was passed. The Act bans
political donations and imposes mandatory expenditure caps on parties, candidates, and third parties. It is the first such law reform in the world. In 2026, Malinauskas called upon the
Adelaide Writers' Week to ban Palestinian-Australian author
Randa Abdel-Fattah for her pro-Palestinian comments, culminating in the
Adelaide Writers' Week boycott. He had previously alluded to potentially defunding the festival, a move he ruled out as an example of
Putinism. In the
2026 South Australian state election Malinauskas led the Labor party to one of the most comprehensive victories at the state level in Australia. Labor won 34 seats on a seven-seat swing, the most that SA Labor has ever won at an election. It also resulted in the second-largest majority government in South Australian history, with the opposition reduced to only eight MHAs (five Liberals and three One Nation) in total. == Political positions ==