The White House is planning to start addressing the nation’s immigration system as early as May, two senior administration officials said Thursday. President Obama will rely on a bipartisan, diverse group of experts to help build the framework for legislation, the officials said. One official noted that immigration will not be “on the same track” as other key initiatives like health care and energy, and “nobody’s promising legislation or a vote this year.” There are roughly 12 million illegal immigrants in the United States