Boris Johnson is flying back to Britain as he considers an audacious attempt to win a second term as prime minister only weeks after he was forced to step down, with some colleagues warning his comeback could create more political chaos. The potential candidates to replace Prime Minister Liz Truss, who dramatically quit on Thursday after only six weeks in power, were embarking on a frantic weekend of lobbying to secure enough nominations to enter the leadership contest before Monday’s deadline. Johnson, who has on holiday in the Caribbean when Truss resigned and has said nothing publicly about…