What are the circumstances surrounding Kevin McAleenan's departure?

Acting Secretary of Homeland Security Kevin McAleenan left his post Friday after just six months on the job. In a tweet, Donald Trump said McAleenan wanted to "spend more time with his family and go to the private sector." CBS News correspondent Jeff Pegeus and CBS News immigration reporter Camilo Montoya-Galvez spoke with CBSN about the circumstances surrounding his departure.