Trump's Personal Lawyer Declined

I heard Barr, our Attorney General (Trump's personal Lawyer) declined to go on TV to say he did nothing illegal.  That is a shock since he has done everything else, like investigating Trump's enemies and going after TV News anchors.  Wonder if Barr has a line of criminality that he refuses to cross?  Shocking in our current political atmosphere!  Seems like the main qualification to be a Republican is to be a criminal and be loyal to Trump and not the Constitution!