[1][2][3] A member of the Conservative Party, she previously served as Chief Whip of the House of Commons and Parliamentary Secretary to the Treasury from September to October 2022.

[10][11] In October 2014, Morton attempted to be selected as the Conservative candidate for Richmond, but was defeated by Rishi Sunak, the future Prime Minister.

[17] In the summer of 2016, she was appointed a Parliamentary Private Secretary at the newly created Department for Business, Energy and Industrial Strategy.

[27][28] In the 2020 cabinet reshuffle, Morton was promoted to Parliamentary Under-Secretary of State for European Neighbourhood and the Americas at the Foreign and Commonwealth Office.

[29][30] She was reshuffled to the Department for Transport on 19 December 2021, following the move of responsibility for the United Kingdom's relationship with the European Union to the Foreign, Commonwealth and Development Office, in a straight job-swap with Chris Heaton-Harris.

[32] The same day she was the recipient of alleged abusive texts from Gavin Williamson over his exclusion from the guest list of the funeral of Queen Elizabeth II at Westminster Abbey.

[33] On 19 October 2022, during an ongoing political crisis, Morton was reported to have resigned as Chief Whip during a Commons vote and then un-resigned later that evening.

Morton asked for anonymity but the text content was leaked to the Sunday Times[41] and also appeared in the Telegraph and Metro on 7 November 2022.

[44][45] Morton stood in the election for Deputy Speaker in the House of Commons on 23 July 2024, but was defeated by her Conservative colleagues Nus Ghani and Caroline Nokes.