‘Guiliani and Trump fear Michael Cohen' which explains their attacks: Adviser Lanny Davis

President Donald Trump fears what his longtime fixer is telling federal prosecutors, an advisor to Michael Cohen explained in an interview with MSNBC chief legal correspondent Ari Melber.

Lanny Davis is a former Clinton administration White House lawyer and onetime Cohen attorney.

"First, let's notice that Donald Trump and Rudy Giuliani have spent days and days -- and tweets and tweets -- attacking and personally disparaging Michael Cohen more than anyone else," Davis.

"Why are Giuliani and Trump so focused on Michael Cohen? The answer, of course, we will find out is that he knows more -- having been his lawyer for 10 years and suddenly realizing the danger to the country and now is ready to tell the truth

"I have no doubt that both Giuliani and Trump fear Michael Cohen telling the truth more than anybody else," he continued. "Because he knows more having worked for him for 10 years.

Watch: