“Because Brexit isn’t just about the letter that says we want to leave, it’s about negotiating the deal, about getting the right deal from Europe.” She added: “People have a unity of purpose. The public want us to deliver on leaving the European Union and they want us to build that stronger Britain for the future beyond leaving the European Union.”Under the terms of the Fixed-Term Parliaments Act, Mrs May must secure a two-thirds majority of MPs to bring the election forward by three years from the scheduled date of May 2020. Mrs May said that if she had not brought forward the date of the election, the Brexit negotiations would have been coming to a head just as the Government was preparing to go to the polls.”Had the election been in 2020, we would have been coming up to the most crucial part of the negotiations at the end of the negotiations in what would be starting to be the run-up to a general election,” she said.The Prime Minister said she was committed to regaining control of Britain’s borders but refused to be drawn on whether or not free movement of labour would end as soon as the UK withdrew from the EU. “Real talks” about Britain leaving the European Union will only begin after Britain’s snap general election, Jean-Claude Juncker believes.The president of the European Commission “considers that the real political negotiations on Article 50” will start after the early vote on June 8.Mr Juncker had a phone conversation with Prime Minister Theresa May on Tuesday evening following her announcement of an early election in a move that shocked Westminster.Speaking today, a European Commission spokesman said: “Following their conversation, the President considers that the real political negotiations on Article 50 with the United Kingdom will start after the elections foreseen for the 8th of June.”Mrs May had performed a U-turn by saying an election would also improve the UK’s position in negotiations with European Union leaders, having previously repeatedly denied she would seek an early vote. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings. Mrs May said the election would give the opportunity for “stability and certainty” during the period of the Brexit process.MPs are on Wednesday expected to back Mrs May’s demand for an early vote, three years ahead of the next scheduled general election.Explaining her volte face, Mrs May told BBC Radio 4’s Today programme: “When it came to triggering Article 50, around that time it became clear the extent to which the opposition parties in Westminster were intent on what I would describe as frustrating the Brexit process.