Michael Cohen is having reservations about his highly anticipated public appearance before Congress next month, fearing that President Donald Trump’s frequent diatribes against him could put his family in danger, according to sources close to Cohen.

While his testimony before the House Committee on Oversight and Reform appears to be on track to occur as scheduled on Feb. 7, it is now less certain than it initially appeared that Cohen – Trump’s former attorney and fixer – will sit before lawmakers, those sources told ABC News.

As the president continues to engage in what Cohen sees as reckless and unsubstantiated claims he believes are intended to intimidate him, Cohen has expressed to friends his concern that Trump’s heated rhetoric on television and Twitter could incite an unstable person to target him or his family.