oath-tacking
Oath-tacking is when someone takes an oath, then acts like they're still good, but really they're just using it as a disguise to be a total fraud.
The mayor took an oath to clean up the city, then made it look worse by building a giant statue of himself.
The senator swore to protect the people, then took all the money for himself.
The governor said he’d keep the economy strong, but now it's weaker than a wet tissue.