Do you even know the legal definition of exonerate? Here is the legal definition of exonerate...."In general, an exoneration occurs when a person who has been convicted of a crime is officially cleared based on new evidence of innocence."
Now notice it states when convicted of a crime. Now did Mueller convict Trump with a crime? No he did not. See this is an example of the crap which is spewed out by stupid people such as yourself.