Oh, Reagan totally.
Manipulating foreign politics to serve his business interests regardless of the consequences, giving huge contracts to his buddies, deregulating everything. Total Nagus.
Madoff would make a terrible Nagus. Any real Nagus, if he got that deep in a scheme would have an exit strategy and wouldn't get caught. Madoff would end up hanging from the Ferengi tower of commerce.
Ooh, Donald Trump! He looks AND acts like a Ferengi. And he built the Ferengi Tower of Commerce in real life!