Chicago Mayor Rahm Emanuel is said by well-connected Democrats to be considering the idea of running for president if Hillary Clinton opts out of the 2016 race.

President Barack Obama, left, and Chicago Mayor Rahm Emanuel walk on the tarmac upon the president's arrival in the Second City in October on Air Force One. (Pablo Martinez Monsivais/AP)

The 53-year-old Emanuel, who is busy raising money for his 2015 reelection campaign in the Windy City, has had discussions both over the phone and face to face in the past month with Democratic Party donors and fundraisers about a possible White House run, according to sources.