Several news stories have likened Clinton’s actions to those of retired Gen. David Petraeus, but the situations are very different. Petraeus showed a notebook containing highly classified information—names of agents, code words, and ongoing tactical operations in the U.S. war in Afghanistan—to Paula Broadwell, who was writing a book about him.

Many politicians use private addresses, but private servers like the one Clinton used are rarely seen, said John Wonderlich, a policy director at the Sunlight Foundation, a nonpartisan group focused on government transparency, for a prior PolitiFact story.