Clinton, the former secretary of state and now the leading Democratic presidential candidate, wants to focus on the economic issues she and her team believe will drive the 2016 election. But they remain unable to fully escape the swirling questions surrounding her decision to run her State Department correspondence through an unsecured system set up at her New York home.
For Clinton, the news amounted to a major distraction on a day when she'd hoped to focus on unveiling a new set of economic policies. Instead, she opened her New York City speech by addressing the controversy, decrying some reports as inaccurate.
Though the probe is not criminal and does not specifically target Clinton, the latest steps by government investigators will further fuel the partisan furor surrounding the 55,000 pages of emails already under review by the State Department.
A statement from the intelligence inspector general, I. Charles McCullough and his counterpart at the State Department, Steve Linick, said that McCullough's office found four emails containing classified information in a limited sample of 40 emails.
"This classified information should have never been transmitted via an unclassified personal system," they said.
Some media initially reported that Justice Department had been asked to consider a criminal investigation into whether she mishandled her emails.
"We are all accountable to the American people to get the facts right, and I will do my part but I'm also going to stay focused on the issues," she said.
It was not immediately clear whether the Justice Department would investigate the potential compromise highlighted by the intelligence inspector general, I. Charles McCullough. His letter didn't suggest any wrongdoing by Clinton, according to U.S. officials speaking on the condition of anonymity because they were not authorized to discuss the referral publicly.
But the inspector general's office said it was concerned that "these emails exist on at least one private server and thumb drive with classified information and those are not in the government's possession," said Andrea Williams, a spokeswoman for McCullough. None of the emails were marked as classified at the time they were sent or received, but some should have been handled as such and sent on a secure computer network, said the letter sent to congressional oversight committees.
Clinton has maintained that she never sent classified information on her personal email account, which she said in March she used as a matter of convenience to limit her number of electronic devices.
The State Department has made public some of the emails involving Clinton, and is under court order to make regular further releases of such correspondence.
The aim is for the department to unveil all of 55,000 pages of the emails she turned over by Jan. 29, 2016. But a federal judge this month chastised the department for moving too slowly in providing The Associated Press with thousands of emails submitted through the Freedom of Information Act.
An Associated Press-GfK poll released last week found that voters view her as less decisive and inspiring than when she launched her presidential campaign just three months ago. Just 3 in 10 said the word "honest" describes her very or somewhat well.
