Chicago Mayor Rahm Emanuel has a problem with the "Trump" sign going up on the Trump International Hotel and Tower in the Windy City.
He says it's tasteless.
The city already gave authorization for the sign, made up of five, 20-foot-high letters spelling out the word "Trump."
But the mayor's office is now looking for options to get Trump to take it down or change it.
A spokeswoman for Emanuel said the mayor believes it's "an architecturally tasteful building scarred by an architecturally tasteless sign."
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Trump has responded, saying he thinks the city of Chicago has bigger problems to worry about than a sign.
Trump also says his sign is "magnificent and popular."