Here's an inside look at Jane Fraser's appointment as Citigroup's next CEO

Jane Fraser has been appointed as Citi's incoming CEO, the first female CEO to lead a major bank. New reporting from CNBC.com reveals that former Citi CEO Michael Corbat exited his role much earlier than the company had intended after regulatory and share prices issues accelerated his departure. Hugh Son, CNBC.com's banking reporter, joins "Squawk Box" to discuss.