Not that it’s going to happen, but couldn’t a state prosecutor theoretically bring some sort of charge against him?
Yes, contempt of congress, which literally could land in in detainment for as long as it takes to get him to testify.
However realistically the republican critters in the house and senate do not have the testosterone to actually do the right thing and enforce it.
Oh, misread the state part, I was referring to what either house can do. Not sure if a state prosecutor can do anything unless he lies under oath at this point.