Phillips served as a Brexit Party member of the European Parliament (MEP) for the South East England constituency from 2019 to 2020.

[3][4][5] Phillips made a film about the UK Independence Party (UKIP) as a student journalist while covering the 2007 National Assembly for Wales election.

[6] Soon after the 2016 United Kingdom European Union membership referendum in which she voted for Brexit, she left UKIP, at around the same time as Farage, and in September joined the Conservatives, a few weeks after Theresa May had been elected as leader.

[7] She explained her reasons for joining the Conservative Party as her admiration for then Prime Minister Theresa May's positions on Brexit, grammar schools, fracking, and the infighting within UKIP.

[8] In May 2019, Phillips was announced as the Brexit Party's candidate for the South East England constituency in the European parliamentary election.

[11] In July of the same year, Phillips admitted to working for SCL Group, the parent company of Cambridge Analytica, on Kenyan President Uhuru Kenyatta's successful 2017 re-election campaign.

[14] In the European Parliament, Phillips was a member of the Committee on Development, and was part of the delegation for relations with South Africa.