In early-February 2020, Mokgalapa announced his decision to resign. The DA then announced on 17 February that they had selected Williams as their candidate to replace Mokgalapa.[8] However, in March 2020, the Gauteng provincial government placed the municipality under administration and dissolved the council.[9] After months of legal challenges, the Supreme Court of Appeal overturned the provincial government's decision on 27 October 2020.[10] On 30 October, Williams was elected as the new executive mayor by defeating the EFF's MoAfrika Mabogwana. He received 97 votes compared to 25 for Mabogwana. The ANC abstained from voting.[11] On 5 November, Williams announced the formation of his first mayoral committee.[12]
On 23 August 2021, DA leader John Steenhuisen announced that the DA had selected Williams to be the party's mayoral candidate for the City of Tshwane for the local government elections on 1 November 2021.[13] At the election, no party won an outright majority and the DA lost 24 seats in council, becoming the second largest party after the ANC.[14]
Williams was re-elected as mayor unopposed at the inaugural sitting of the City of Tshwane municipal council on 23 November 2021 after the ANC declined to put forward their candidate.[15][16] On 14 December, Williams announced his new mayoral committee consisting of DA, ActionSA and Freedom Front Plus councillors.[17] Williams said he was "relieved" that the DA could form a majority coalition government.[18] The coalition government consists of five parties: the DA, ActionSA, the FF Plus, the Congress of the People and the African Christian Democratic Party.[19]
On 13 February 2023, Williams announced his resignation as mayor with effect from midnight, saying in his resignation letter that "it is in the best interest for continued stability of the coalition in the city." Williams had been under pressure from coalition partners to resign after the City of Tshwane received an adverse audit opinion from the Auditor-General for the 2021/22 financial year during which the metro racked up R1.2 billion in wasteful expenditure.[20][21] Williams later that same day submitted a second resignation letter that amended his resignation date, changing it to take effect from midnight on 28 February 2023.[22] Finance MMC Peter Sutton was then appointed as acting mayor as Williams went on leave until 28 February.[23]
Williams submitting two resignation letters caused controversy and confusion, on whether he was still mayor or not. EFF members stormed Tshwane House on 16 February 2023 and demanded the removal of political staff and members of Williams' mayoral committee whom the party claimed were no longer in office.[24]
The speaker of council, Dr Murunwa Makwarela, announced on 21 February 2023 that his office had sought legal advice on the two resignation letters and that the legal opinion had found that Williams' first resignation letter was legally binding and valid and the subsequent amended, second resignation letter was concluded to be invalid, which meant that Williams' resignation took effect on 13 February and that the metro was now without a mayor.[25][26][27]
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