President Barack Obama in Chicago

President Barack Obama has a laugh while taking in the first half of a Bulls game Oct. 27, 2015.

President Barack Obama sits courtside while the Chicago Bulls play the Cleveland Cavaliers during the first period of the season opener at the United Center on Oct. 27, 2015, in Chicago.

President Barack Obama arrives at the Bulls game Oct. 27, 2015.

President Barack Obama speaks to the International Association of Chiefs of Police on Oct. 27, 2015, during the group’s 122nd annual conference and exposition at McCormick Place in Chicago.

President Barack Obama speaks to the International Association of Chiefs of Police on Oct. 27, 2015, during the group’s 122nd annual conference and exposition at McCormick Place in Chicago.

People line up hoping to get a glimpse of President Barack Obama as he arrives in the Loop for a private meeting, Oct. 27, 2015.

President Barack Obama greets attendees after speaking to the International Association of Chiefs of Police on Oct. 27, 2015, during the group’s 122nd annual conference and exposition at McCormick Place in Chicago.

Mayor Rahm Emanuel and police Superintendent Garry McCarthy listen to President Barack Obama speak to the International Association of Chiefs of Police on Oct. 27, 2015, in Chicago.

People line up hoping to get a glimpse of President Barack Obama as he arrives in the Loop for a private meeting on Oct. 27, 2015.

Police chiefs listen to President Barack Obama speak Oct. 27, 2015, at the annual convention of the International Association of Chiefs of Police in Chicago.

President Barack Obama walks on the stage at the annual conference of the International Association of Chiefs of Police on Oct. 27, 2015, at McCormick Place in Chicago.

President Barack Obama greets spectators Oct. 27, 2015, as he arrives on Air Force One at O’Hare International Airport.

President Barack Obama greets spectators Oct. 27, 2015, after arriving at O’Hare International Airport.

President Barack Obama greets spectators Oct. 27, 2015, as he arrives at O’Hare International Airport.

President Barack Obama, shown in 2015 at O’Hare International Airport, will give his farewell speech Jan. 10, 2016, in Chicago.

Air Force One lands Oct. 27, 2015, at O’Hare International Airport.