It looks like Hillary Clinton, Donald Trump and Bernie Sanders were all under federal investigation during the election.
Bernie Sanders' wife and former chief of staff Jane Sanders was hired as president of the nontraditional school Burlington College, that was already struggling. In her plan to expand the school, she falsely claimed almost $2 million in donations to repay a loan she secured for 33 acres of land. The land was purchased, but the school's donation and enrollment levels couldn't repay the loan. Jane Sanders was fired, and the school shut down in 2016. She claimed that the school was in excellent financial condition when she left.
The chairman of the Trump campaign in Vermont filed the claim which started the investigation. Bernie Sanders' office is mentioned as lobbying the bank to approve the loan.
Bernie and Jane Sanders, under FBI investigation for bank fraud, hire lawyers - CBS News