FILE - In this Jan. 23, 2014, file photo, San Antonio Mayor Julian Castro speaks about President Barack Obama's signature health care law at the Families USA?s 19th Annual Health Action Conference in Washington. Obama is considering nominating San Antonio's mayor to be housing secretary. That's according to people familiar with the selection process. They spoke on condition of anonymity because they weren't authorized to discuss the matter by name. Castro would succeed Shaun Donovan, a member of Obama's original Cabinet. (AP Photo/Charles Dharapak, File)