Democratic presidential candidate Hillary Clinton has previously stated that classified information never traveled across her private server. However, the State Department has acknowledged that "top secret" information was in seven email chains sent or received by her.

Top-secret information in e-mails Democratic presidential candidate Hillary Clinton has previously stated that classified information never traveled across her private server. However, the State Department has acknowledged that "top secret" information was in seven email chains sent or received by her. Richard Drew/AP

Clinton has come under fire for using a private email address during her time as secretary of state. The emails are being screened and released in batches. Here are some things we’ve learned from them.

Clinton has come under fire for using a private e-mail during her time as secretary of state. The e-mails are being screened and released in batches. Here are some things we’ve learned from them.

Clinton has come under fire for using a private e-mail during her time as secretary of state. The e-mails are being screened and released in batches. Here are some things we’ve learned from them.

Hillary Rodham Clinton’s attorney has provided the FBI with the private server that housed her e-mail during her four years as secretary of state, Clinton’s presidential campaign said Tuesday.

Her attorney also gave agents a thumb drive containing copies of thousands of e-mails that Clinton had previously turned over to the State Department.

The FBI has been looking into the security of Clinton’s unusual private system, which has emerged as an issue in her campaign.

[Intelligence official: Top secret information traveled across Clinton’s private server]

1 of 46 Full Screen Autoplay Close Skip Ad × Clinton on the campaign trail View Photos Former secretary of state Hillary Rodham Clinton has hit the ground running, visiting several states on her quest to become the Democratic nominee for president. Caption The former secretary of state, senator and first lady is the Democratic nominee for president. July 31, 2016 Hillary Clinton is seen aboard the campaign bus in Cleveland on the third day of a bus tour through Pennsylvania and Ohio. Melina Mara/The Washington Post Buy Photo Wait 1 second to continue.

Nick Merrill, a Clinton spokesman, said Tuesday night that Clinton is cooperating with the probe. He declined to say whether the FBI ordered that she turn over the devices and when they were turned over.

“She directed her team to give her e-mail server that was used during her tenure as secretary to the Department of Justice, as well as a thumb drive containing copies of her e-mails already provided to the State Department,” Merrill said. “She pledged to cooperate with the government’s security inquiry, and if there are more questions, we will continue to address them.”

The inquiry by the FBI is considered preliminary at this point and appears to be focused on ensuring the proper handling of classified material.

[FBI looking into the security of Hillary Clinton’s private e-mail setup]

The agency’s efforts included contacting the Denver-based technology firm that helped manage the Clinton’s unusual private e-mail system.

Clinton has resisted relinquishing control of the server. In March, she said the server contained “personal communications from my husband and me.”

“I believe I have met all of my responsibilities, and the server will remain private,” she said then, in response to a question from a reporter about whether she would allow an independent party to examine the device.

Also that month, her attorney David Kendall told a congressional oversight committee in an e-mail that there was “no basis” to support a third-party examination of the server. He indicated that he had confirmed with IT staffers that no e-mail sent or received by Clinton’s account while she was secretary of state remained on the server or backup systems associated with the system.

“Thus, there are no hdr22@clintonemail.com e-mails from Secretary of State Clinton’s tenure on the server for any review, even if such a review were appropriate or legally authorized,” he wrote.