On 6 November 2022, Potaka was selected as the National Party candidate for the 2022 Hamilton West by-election caused by the resignation of independent MP Gaurav Sharma who had been expelled from the Labour Party.[8] During the by-election campaign, Potaka stated that Hamilton had become known as the "ramraid capital of New Zealand" in response to the nationwide surge in ram raids in 2022. He also said that he wanted "Hamilton West to be the best city to grow up and grow old in."[9]
On 10 December 2022, Potaka won the election, beating Labour candidate Georgie Dansey. Potaka gained 6974 votes compared to Dansey's 4541, a margin of 2433.[10]
On 19 January 2023, Potaka was named as National's spokesperson for Māori development and associate spokesperson for housing.[11][12]
Second term, 2023–present
During the 2023 New Zealand general election held on 14 October, Potaka retained Hamilton West by a margin of 6,488 votes over Labour candidate Myra Williamson.[13]
On 15 January 2024, Potaka and Prime Minister Christopher Luxon met with the Māori KingTūheitia Paki to discuss several of the Government's policies concerning Māori including the proposed Treaty Principles legislation and plans to roll back the use of Māori language in the public service.[15] On 20 January, Potaka and fellow National MP Dan Bidois attended a national hui of unity convened by King Tūheitia at Turangawaewae Marae. Potaka defended Luxon's decision not to attend the national hui and disputed several of the speakers' claims that the Government was underpinned by White supremacy.[16]
On 13 August 2024, Potaka as Minister for Māori Crown Relations announced that Te Puni Kōkiri (the Ministry for Māori Development) would assume Te Arawhiti's (the Office for Māori Crown Relations) monitoring and Treaty settlements compliance functions. This decision was criticised by Te Pāti Māori co-leader Debbie Ngarewa-Packer, the Green Party's Māori Crown Relations spokesperson Steve Abel and the Labour Party's Peeni Henare, who described it as a "backward step" in the New Zealand Crown's relationship with Māori.[17]
On 14 October 2024, Potaka as Minister of Conservation announced 19 new marine protection areas in the Hauraki Gulf.[18]