The installation of 20-foot-tall letters spelling out T-R-U-M-P on the side of the billionaire's gleaming Chicago skyscraper has triggered a war of words between Donald Trump and Rahm Emanuel — with the city's mayor saying he's looking for a way to undo the "architecturally tasteless" sign, and the developer in no mood to take anything down.

The spat pits the abrasive billionaire and relentless self-promoter who turned the words "You're Fired!" into a personal motto against a mayor who did not get nicknames like "Rahmbo" and "The Rahminator" because he shies away from a fight....

"If this sign was in Atlantic City or Las Vegas, nobody would care — but it is in Chicago, and in a part of Chicago full of great buildings from the 1920s to the 1960s and onward," said Blair Kamin, a Pulitzer Prize-winning architecture critic for the Chicago Tribune, who became part of the scuffle with his withering criticism of the Trump sign. "None of the other towers have signs on them."...

For starters, he said, his skyscraper replaced an "ugly" Chicago Sun-Times building and its equally unattractive sign. Not only that, he said, but he expects the insignia to someday be as revered in Chicago as the iconic Hollywood sign is in Los Angeles.