Lewandowski has two lawyers to represent him, Scott Richardson and Kendall Coffey, and by all appearances intends to defend himself. Marc Bunjowski of the Jupiter, FL PD is the arresting police officer.
There is evidence that Fields committed simple battery against Trump too, although I'd say it would be a mistake to get down in the mud with that pig.
There are some alleged emails that would be subject to Discovery.
http://www.freerepublic.com/focus/f-news/3415530/posts