While announcing the nomination, Obama comments, “To know Jim Comey is also to know his fierce independence and his deep integrity. […] [H]e doesn’t care about politics, he only cares about getting the job done. At key moments, when it’s mattered most, he [stood] up for what he believed was right. He was prepared to give up a job he loved rather than be part of something he felt was fundamentally wrong.”
Comey had been the deputy attorney general during the Bush administration. Obama’s comment about giving up a job is reference to a 2004 incident where Comey (and others) threatened to resign unless President Bush canceled a surveillance program before its legal authorization expired. Bush gave in and canceled the program. (The White House, 6/21/2013)
Comey is approved by the Senate later in June and starts his ten-year term as FBI director on September 4, 2013. (Federal Bureau of Investigation, 9/4/2013) Comey will later be in charge of the FBI when it investigates Clinton’s email scandal.