Replay More Videos ... MUST WATCH Brexit: What is Article 50? JUST WATCHED Brexit: What is Article 50? The EU parliament will open an extraordinary plenary session of its Conference of Presidents in what will be the first official steps to extricate the UK from its 42-year association with the bloc. In order to begin the process, Britain's government needs to trigger 'Article 50,' the clause in the EU constitution which begins the exit procedure for a member country. 02:06Cameron, who announced his resignation after leading a failed campaign to remain in Europe, has said he won't start the official leaving process -- leaving the decision to his successor who is expected to be in place by the start of September.

Source: CNN June 28, 2016 05:03 UTC