Department spokesperson Melanie Newman says in a statement, “This matter is being reviewed by career attorneys and investigators and does not meet the criteria for the appointment of a special prosecutor.” There has been increasing pressure, especially from Republicans, to appoint a special prosecutor.
Many worry about a potential conflict of interest if Attorney General Loretta Lynch were to head any prosecution. Although Lynch isn’t seen as personally close to Hillary Clinton, Lynch was appointed to be the US attorney for the Eastern District of New York by President Bill Clinton in 1999. Furthermore, there is speculation that Lynch might keep her job as attorney general if Clinton wins the presidential election in November 2016, giving her a personal investment in the outcome of any prosecution.
Senate Judiciary Committee chair Charles Grassley (R) has said that a special prosecutor would reassure Americans that decisions are made “without regard to any political considerations.” Donald Trump, the frontrunner in the Republican presidential primaries, said in October 2015, “I think they probably won’t indict her, because the attorney general is from New York, who I believe is a friend of Hillary Clinton.” (The Hill, 2/8/2016)