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CHICAGO (AP) - The installation of 20-foot-tall letters spelling out T-R-U-M-P on the side of the real estate billionaire's skyscraper in central Chicago has triggered a war of words between the developer and the mayor of a city that takes its architecture seriously.

Mayor Rahm Emanuel greeted the big, bold sight of Donald Trump's last name recently by calling the sign "architecturally tasteless." Emanuel acknowledges that Trump had City Council approval and that there may not be much he can do, but says his office is looking for ways to undo what Trump did.

Trump is in no mood to undo anything, and promises a legal fight if anyone tries to make him take down his sign that he says people say is a welcome addition to the city's skyline.

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