The Role of Prosecutors in Defending President Trump

Bob Greene: We know Michael Cohen has been in and out of the DA's office for a long time now. He says he produced checks that were written by President Trump to him as reimbursement for $130,000 paid personally to Stormy Daniels. But we don't know what else might be out there to potentially impeach his credibility, Greene says. Greene: Prosecutors like to take their time because they only get one shot really to get it right. On the other hand, they are racing against the political clock with an election coming up.