[5] During his first term, Walker lobbied for the preservation of maternity services in Lumsden and greater support for Queenstown businesses affected by the COVID-19 pandemic in New Zealand.
[6][7] Walker was also a member of Parliament's primary production select committee and served as the party's associate agriculture spokesperson between 12 March 2018 and 25 May 2020.
[9] On 2 July 2020, Walker again attracted media attention when he issued a press release criticising the Labour-led coalition government for not consulting residents of Dunedin, Queenstown, and Invercargill about hosting quarantine facilities for 11,000 returnees from India, Pakistan and South Korea.
[6][13][14] That same day, former National Party president Michelle Boag admitted passing COVID-19 patient details to Walker and resigned from her position as chief executive of the Auckland Rescue Helicopter Trust.
[17] On 30 July 2020, a report published by former solicitor general Michael Heron, QC, concluded Walker was responsible for the unauthorised disclosure of sensitive information, his motivations were political and his actions were not justified or reasonable.