London: Britain could remain in the EU for the foreseeable future, with 10, Downing Street appearing not to know how to negotiate the divorce, US Secretary of State John Kerry said. In order to leave the EU, Britain will have to implement Article 50 of the Lisbon Treaty, which would kickstart a process that could last months, if not years before an exit was formalized. This would involve a series of renegotiations of treaties and other headaches for Britain. "This is a very complicated divorce", Kerry said in Colorado at the Aspen Ideas Festival, days after Cameron announced he was stepping down. The British Prime Minister feels “powerless” to negotiate the country’s exit, which he had campaigned against, RT.com reported. Kerry spoke a day after speaking to Cameron. Kerry said even the high-profile ‘Leave’ campaigners such as former London Mayor Boris Johnson were also in no hurry to leave. Whether this means that Brexit could be reversed remained unclear, Kerry said. “I think there are a number of ways” to go about mitigating the damage, he said.