The FBI is investigating how secure Hillary Rodham Clinton's email practices were when she was secretary of state and used a private email server, reports The Washington Post.
Clinton said previously the private e-mail server she used while secretary of state "had numerous safeguards. It was on property guarded by the Secret Service. And there were no security breaches."
But the setup she used has raised questions, as Clinton campaigns for president.
The FBI has asked Clinton lawyer David Kendall about the security of a thumb drive on which copies of Clinton's emails are stored. The thumb drive is in Kendall's possession.
The Post report cites two anonymous government officials, and says Kendall has confirmed that the FBI is investigating the security of the devices in question.
The FBI's interest in Clinton's e-mail system comes after the intelligence community's inspector general referred the issue to the Justice Department in July. Intelligence officials expressed concern that some sensitive information was not in the government's possession and could be "compromised." The referral did not accuse Clinton of any wrongdoing, and the two officials said Tuesday that the FBI is not targeting her.
Kendall confirmed the contact, saying: "The government is seeking assurance about the storage of those materials. We are actively cooperating."
A lawyer for the Denver company, Platte River Networks, declined to comment, as did multiple Justice Department officials.