Rep. Debbie Wasserman Schultz (D-Fla.), chair of the Democratic National Committee said the party will consider the message hosting the convention in a given location would send to labor unions. (AP Photo/Ross D. Franklin, File)

The Democratic National Committee has asked 15 cities to submit bids to host the party's 2016 presidential nominating convention, a committee official said Tuesday.

Democrats have asked for formal proposals from Atlanta, Chicago, Cleveland, Columbus, Detroit, Indianapolis, Las Vegas, Miami, Nashville, New York, Orlando, Philadelphia, Phoenix, Pittsburgh and Salt Lake City.

CNN first reported the list of contenders.

In a letter to mayors of the cities in contention, DNC chair Rep. Debbie Wasserman Schultz (Fla.) said the party will consider the message hosting the convention in a given location would send to labor unions, a major Democratic constituency.

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