Trump needs to have Attorney General Sessions open an investigation of Zer0bama illegally sending classified emails to an unclassified server.
And convict the MuzzFelon of it, too.
I think he needs to go for the big enchilada myself and question the legitimacy of his Presidency. Make him prove that he was indeed eligible. Then he can do even more than just erase his legacy!!! He can bury it, make him pay for all those vacations he took on the American dime, imprison and then deport him as well.