 On 15 April 2018 Adonis attended the launch event of the People's Vote, a campaign group calling for a public vote on the final Brexit deal between the UK and the European Union.In the 2019 European Parliament election, Adonis was second on Labour's party list for South West England but was not elected.Labour's share of the vote was 6.5% (a fall of 7.3% relative to the 2014 result) and the party lost its only MEP in the region.