What led to Starmer's resignation as U.K. prime minister and who will likely replace him

Keir Starmer announced he's resigning as U.K. prime minister less than two years after he led the Labour Party to a general election victory. Now, Andy Burnham has emerged as the frontrunner to replace him. CBS News' Inaya Iman explains what led to Starmer's resignation and why Burnham is likely to be the country's next prime minister.