2015–2016 United Kingdom renegotiation of European Union membership
The 2015–2016 United Kingdom renegotiation of European Union membership was an unimplemented non-binding package of changes to the United Kingdom's terms of its European Union (EU) membership as a member state and changes to EU rules which were first proposed by Prime Minister David Cameron in January 2013, with negotiations beginning in the summer of 2015 following the outcome of the UK General Election. The package was agreed by the President of the European Council Donald Tusk, and approved by EU leaders of all 27 other countries at the European Council session in Brussels on 18–19 February 2016 between the United Kingdom and the rest of the European Union.