The UK Independence Party has backed the idea of the UK unilaterally leaving the European Union (Brexit) since its foundation in 1993. During the 23 June 2016 referendum on the issue, whilst the Conservatives had no official position, although its leader David Cameron was in favour of remaining in the EU albeit after some renegotiation of the terms of membership, the party remained profoundly split, as it always had been. The Labour Party officially supported remaining in the EU, although party leader Jeremy Corbyn did suggest early on in the campaign that he would consider withdrawal, a position he had personally advocated from the far left for many years, in fact throughout his period as a Labour MP. The Liberal Democrats were the most adamantly pro-EU party, and since the referendum, pro-Europeanism has been their main policy.