The Laws being what They are, He couldn't Charge Trump with a Crime

 "If we had confidence that the president clearly did not commit a crime, we would have said so." -- Robert Mueller
  At another point in his speech, Mueller noted the Justice Department policy does not allow it do charge a sitting president with a crime.
   And, if the law says you can't charge him with a crime, it would seem to follow you probably shouldn't even make the accusation that a crime was committed.
   The laws being what they are, they don't allow the truth.
  But, this, also from Mueller: "When a subject of an investigation obstructs that investigation or lies to investigators, it strikes at the core of their government's effort to find the truth and hold wrongdoers accountable."
   That isn't alleging a crime (although it comes perilous close with that word "obstructs"), but it is a grave characterization of Trump's conduct, the same.
   And, Mueller noted that while Justice Department policy doesn't allow charging a sitting president with a crime, there is a route to justice placed right in the Constitution. Could he be referring to impeachment?
   Can we think of anything else we would be referring to?