Defamation is a state created claim. The state has developed the rules and creates the judicial procedures/forums for that particular claim to be tried. To allow him to make this action a federal claim under due process, could effectively turn this due process claims into a tort. His avenue of redress is state defamation claim. He has no right because there is a preexisting state process for this type of claim. If a state creates it, state has procedures, don't look to Due Process.