The FBI has managed to recover deleted emails from the private email server that Hillary Clinton used for both work-related and personal use during her tenure as U.S. secretary of state.

Clinton has faced months of scrutiny ever since it was discovered that she may have stored classified material in a private email server while she was working under the Obama administration. Critics say her use of the server could have put national security secrets at risk. Opponents of the Democratic presidential front-runner also accuse her of failing to be transparent and follow record-keeping laws.

Clinton argues that she deleted the emails simply because they involved personal matters. After digging, internal government watchdogs, however, determined that classified information ended up on the system. In turn, their findings prompted the FBI inquiry.

Inside sources confirmed to Bloomberg on Tuesday that the FBI has recovered an unknown amount of deleted emails. The FBI added that their investigation will continue for at least a few more months as they examine the server in order to determine whether any information or classified data was mishandled.

"We've cooperated to date and will continue to do so, including answering any questions about this that anyone including the public may have," said Clinton spokesman Nick Merrill when asked about the report, according to AOL.com.

Because the FBI managed to salvage personal e-mails that Clinton said had been deleted, there is now the possibility that the Democratic presidential candidate's correspondence could eventually be disclosed to the public.

Earlier this month, the former first lady said that using a private "homebrew" email server was a "mistake" during an interview with ABC News' David Muir. She also acknowledged that she should have used different accounts to separate her work and personal business.

"That was a mistake. I'm sorry about that. I take responsibility," she said.