Former White House national security adviser Michael Flynn has expressed concern about the potential legal exposure of his son, Michael Flynn Jr., who, like his father, is under scrutiny by special counsel Robert Mueller, multiple sources familiar with the matter tell CNN.

Flynn’s concern could factor into decisions about how to respond to Mueller’s ongoing investigation. The special counsel is looking into Russian meddling in the 2016 campaign as well as the business dealings of key campaign advisers to President Donald Trump.

Flynn’s wife, Lori, shares his concerns about their son’s possible legal exposure, according to a person who knows the family.