By Jessica Frank-Keyes Rishi Sunak has staked his political future on the promise of “economic stability” and Britain’s security as he braved a Westminster downpour to call a general election on July 4. The Prime Minister stood outside a rainy No10 as he announced he had spoken to the King and confirmed the country would go to the polls in just over six weeks. It came after hours of febrile speculation in Westminster, with foreign secretary David Cameron flying back from a visit to Albania for a crunch cabinet meeting. Sunak made the issues of security and economic stability the core of his ge…