Whereas: A Grifter, is somebody who can influence anybody, anywhere, at anytime, into doing whatever they choose to have them do, that will result in the grifter’s personal gain. Usually monetary, but really anything that benefits him or her somehow. […] – Urban Dictionary

The grafter, by contrast, is a run-of-the-mill abuser of the public trust. He needs no audience and prefers not having one. Where the grifter is shameless, the grafter shrinks from exposure, which could only endanger the racket. He is greedy, but not creatively ambitious. He toils in mundane self-dealing, insider trading, bribe taking, witness tampering, and other forms of workaday corruption. Spiro Agnew was a grafter. William Jefferson, the Louisiana congressman who kept cash in the freezer in his apartment, was a grafter. […] – Slate

Suffice it to say, like Trump, these two clowns (Lewandowski and Bossie) are shameless grifters.