According to the reports, the investigation is being led by the FBI office in Little Rock, Arkansas, where the foundation was formed, and CNN reported that it was being overseen by the U.S. Attorney's Office there.
The FBI and Justice Department have reenergized an investigation into the Clinton Foundation that started under the Obama administration, two US officials confirmed to ABC News Friday.
Clinton's chief spokesman, Nick Merrill, on Friday morning excoriated the Federal Bureau of Investigation for re-opening the case, calling the probe "disgraceful" and suggesting it was nothing more than a political distraction from President Trump's Russian Federation controversies.
Just this week Mr Trump tweeted to say Huma Abedin, a close aide to Mrs Clinton, should be jailed over her handling of certain emails.
The FBI office in Little Rock referred the Hill to the FBI headquarters, which also declined to comment. The Clinton Foundation has demonstrably improved the lives of millions of people across America and around the world while earning top ratings from charity watchdog groups in the process.
The U.S. Attorney's Office, as well as the Justice Department, declined to comment in the CNN story. "So we're going to stay focused on what really matters". "I think it's a great thing that it's being looked at", she told Fox News. "That is a fundamental violation of law and that does appear to have happened".
At that time, according to the documents, McCabe was "excluded from any involvement" in public corruption cases in Virginia.
"The fact remains that Hillary Clinton never took action as secretary of state because of donations to the Clinton Foundation", campaign spokesman Josh Schwerin said. It was set up in 1997 by then-President Bill Clinton.
The investigation into the Clinton Foundation has nothing to do with the probe into Ms Clinton's use of a private email server, CBS News reports. The people were not authorized to discuss the investigation publicly and spoke on condition of anonymity.
"Let's call this what it is: a sham", Merrill told The Hill. "This is a philanthropy that does life-changing work, which Republicans have tried to turn into a political football".
Nick Merrill, a spokesman for Ms Clinton, said the probe's goal was to "distract from the indictments, guilty pleas, and accusations of treason from [US President Donald] Trump's own people at the expense of our justice system's integrity".