FILE--In this July 28, 2016 file photo, Sen. Bernie Sanders, I-Vt. and his wife Jane walk through downtown in Philadelphia during the final day of the Democratic National Convention. Sanders and his wife Jane O'Meara Sanders have hired lawyers in the face of federal investigations into the finances of the now-defunct Burlington College, which closed last year due, many feel, to debts incurred when Jane Sanders entered into an ill-advised real estate deal. (AP Photo/John Minchillo, File)

FILE–In this July 28, 2016 file photo, Sen. Bernie Sanders, I-Vt. and his wife Jane walk through downtown in Philadelphia during the final day of the Democratic National Convention. Sanders and his wife Jane O’Meara Sanders have hired lawyers in the face of federal investigations into the finances of the now-defunct Burlington College, which closed last year due, many feel, to debts incurred when Jane Sanders entered into an ill-advised real estate deal. (AP Photo/John Minchillo, File) (AP)

A federal investigation launched in 2016 into possible bank fraud by Jane Sanders, wife of U.S. Sen. Bernie Sanders, is still underway — with “a potential” grand jury review possible.

The probe could thwart Sanders’ 2020 presidential ambitions — as well as the Vermont political plans of Jane Sanders’ daughter, Carina Driscoll.

Individuals questioned by the FBI confirmed to Fox News that the investigation was still open, with FBI agents interviewing at least one witness within the last six weeks.

Jane Sanders is under investigation following a land deal she clinched when she was president of Burlington College in Vermont in 2010.