He straight up tells the US Army that he is not beholden to them or their laws. He breaks the handcuffs they put him, walks to the one-way mirror in the interrogation room, throwing veiled threats at the General that he's merely playing along with them,
The senate hearing is just another instance of him merely goofing around with them. Had the hearing went on normally, he would've just told the senators where to shove it if he didn't like what they were saying.
How is that someone who wants to be seen as a citizen beholden to the laws of men?
To be completely fair, we don't know what he was going to say to the senate precisely. Which is kind of the problem. He's just sort of bumbling around and trying to help, but the framing is so focused on his uncertainty and insecurity that he comes off as more incompetent than anything else.
Like the interrogation. Yeah, he basically ended up saying "Imma do me, like it or not, and you can't stop me". He meant it in a positive way. He was trying to assure them that even though he won't be held accountable by them, he's also not a threat to them either. But it comes off otherwise because of how he's presented himself. That and it's hard to make "Nuh-uh, Imma do what I want" sound mature.