BREAKING: Apple announces Tim Cook to step aside as CEO

The end of an era for Apple. The CEO stepping down. Tim Cook transitioning to the executive chairman.He's led the company since taking over for Steve Jobs in 2011. Let me bring in Christine Romans who's joining us now. This dropped right as we were coming on the air, Christine.And it's super interesting here. You know, Apple's been doing well lately. Um, why the change now.What's going on. >> You know, Tim Cook has 15 years at the head of a storied American company and and really the run has been remarkable ...