Under that constraint, either "do just that" refers to blocking the attorney general from pursuing charges, or it refers to pursuing charges.

How do you use just that?

You use the expression it's just that when you are making a complaint, suggestion, or excuse, so that the person you are talking to will not get annoyed with you. I'm sorry I shouted at you. I didn't mean to. It's just that I was so mad.

What is the meaning of just like that?

phrase. You use just like that to emphasize that something happens or is done immediately or in a very simple way, often without much thought or discussion. [informal, emphasis] Just like that, I was in love.