If Comey had "done the right thing" with the Trump allegations the way he did with the Clinton investigation then the would have indicated that investigation had not led directly to Trump yet but that many of his campaign officials are involved AND ALSO Trump has a history of corrupt and potentially illegal activity that has not been investigated to the extent that it warrants.  Remember when Comey "cleared" Clinton in the email investigation by saying that she had been careless with classified material?  That is the kind of statement he would have given about Trump.