Maybe but he could certainly present his evidence of a crime. He couldn't do that. He simply dumped his evidence, all inconclusive, on congress. Mueller specifically stated he found no evidence of a clear crime on anything in regards to Trump. If you read through his evidence in the report there is nothing conclusive in there at all which is why he couldn't present a direct violation of the law. He has no recordings of Trump, he has no video evidence, he has no witness testimony that Trump did anything wrong. He says Trump may have wanted to have him fired but doesn't have any evidence to back that up. How does he know that, who did he talk to in order to come to that conclusion, what did he hear? He doesn't tell us. Nothing that would ever stand up in a court of law.