Quote Originally Posted by PseRamesses
Convert it to a castle if u want to keep it. It will raise your loyalty by some 20%.
You can't convert a city to a castle once it passes town size I think. Or maybe large. But at 32,000 population, he's got a huge city on his hands, and that absolutely isn't convertible in Vanilla, 1.1, or Carl's BugFixer mod.

He's either got to cheat the population down, pull out and exterminate it, or consider losing it somehow.

Nuke them from orbit. It's the only way to be sure.