New York Mayor Michael Bloomberg (L) looks out a window during a news conference announcing a lease for commercial office space to the law firm WilmerHale that contains incentives for energy efficiency at 7 World Trade Center in New York, April 5, 2011.
Former South African President Nelson Mandela (2-L) listens to New York
City Mayor Michael Bloomberg (L) as actors Robert DeNiro (C) and Hugh
Grant (R) sit with him at an event at New York's City Hall to launch
the First Annual Tribeca Film Festival, May 8, 2002. The festival,
which will showcase world premiere and independent films, was
co-founded by DeNiro and Jane Rosenthall and will open with the
premiere of the film "About a Boy" starring Hugh Grant.
German Chancellor Angela Merkel (C) waves to a crowd as she walks with former Mayor of New York City Michael Bloomberg (2nd R) to the National September 11 Memorial and Museum after laying a memorial wreath next to the Survivor Tree in Manhattan, New York, September 26, 2015.
Former New York City Mayor Michael Bloomberg (L) and UN Secretary-General Ban Ki-moon listen to opening remarks at a "Toward Universal Health Coverage for 2030" seminar during the IMF/World Bank 2014 Spring Meetings in Washington April 11, 2014.
Michael Bloomberg, US investor and special envoy to the United Nations for climate, and EU Commission President Jean-Claude Juncker take part in a conference on financing sustainable growth in Brussels, Belgium, March 22, 2018.
Britain's Prime Minister Theresa May is greeted by businessman and former New York City Mayor Michael Bloomberg at the Bloomberg Global Business Forum in New York, U.S., September 26, 2018.
Michael Bloomberg, the billionaire media mogul and former New York City mayor, eats lunch with Little Rock Mayor Frank Scott, Jr. after adding his name to the Democratic primary ballot in Little Rock, Arkansas, U.S., November 12, 2019.
Former New York City Mayor and possible 2020 Democratic presidential candidate Michael Bloomberg speaks at the Institute of Politics at Saint Anselm College in Manchester, New Hampshire, U.S., January 29, 2019.
New York City Mayor Michael R. Bloomberg meets with incoming Mayor Bill de Blasio (L) at City Hall after his election victory in New York November 6, 2013.
New York City Mayor Michael Bloomberg (C) receives a kiss from a member of the Rockettes during New Year's celebrations in Times Square, New York January 1, 2013.
California Governor Arnold Schwarzenegger (C) and New York Mayor Michael Bloomberg (R) attend a meeting at Credit Suisse before touring the carbon trading floor at Credit Suisse in New York October 16, 2006. Linda Adams, Secretary of the California Environmental Protection Agency, is at left.
Former New York Mayor Michael Bloomberg stands to receive an honorary Doctor of Laws degree as fellow honorary degree recipients musician Aretha Franklin (L) and former United States President George H.W. Bush (R) applaud during the 363rd Commencement Exercises at Harvard University in Cambridge, Massachusetts May 29, 2014.
Former New York City Mayor and possible 2020 Democratic presidential candidate Michael Bloomberg listens as he is introduced to speak at the Institute of Politics at Saint Anselm College in Manchester, New Hampshire, U.S., January 29, 2019.
Former New York City Mayor and possible 2020 Democratic presidential candidate Michael Bloomberg greets diners at Harvey's Bakery and Coffee Shop in Dover, New Hampshire, U.S., January 29, 2019.
Denmark's Prime Minister Lars Loekke Rasmussen and UN Secretary-General's Special Envoy for Climate Action Michael Bloomberg (L) tour the Amager Resource Center (Amager Bakke) in Copenhagen, Denmark May 21, 2019. Ritzau Scanpix/Mads Claus Rasmussen via REUTERS
Michael Bloomberg, the billionaire media mogul and former New York City mayor, eats lunch with Little Rock Mayor Frank Scott, Jr. after adding his name to the Democratic primary ballot in Little Rock, Arkansas, U.S., November 12, 2019.
Outgoing mayor Michael Bloomberg waits for a train on the subway platform at 42nd St. after he left City Hall for last time as Mayor of New York, on New Year's Eve in New York, December 31, 2013. Bloomberg rode the subway home to his Upper East Side home.
New York Mayor Michael Bloomberg kisses the Western Wall as he visits
Jerusalem's Old City August 26, 2003. Bloomberg paid a solidarity visit
to Israel a week after a Palestinian suicide bombing on a Jerusalem
bus, and urged it not to talk peace until such violence stopped.
Former New York Mayor Michael Bloomberg speaks to the media after introducing U.S. President Barack Obama at the U.S.-Africa Business Forum in Manhattan, New York, U.S., September 21, 2016.
New York City Mayor Michael Bloomberg (C), along with survivors and family members of gun violence victims, addresses the media as part of the Mayors Against Illegal Guns group, to announce the release of 34 "I Demand a Plan" videos in New York December 17, 2012. The videos tell stories of Americans whose lives have been changed forever because of gun violence. Bloomberg has upped his stance on the issue since the December 14 Sandy Hook Elementary School shooting massacre in Newtown, Connecticut.
New York City Mayor Michael R. Bloomberg meets with incoming Mayor Bill de Blasio (L) at City Hall after his election victory in New York November 6, 2013.
British Prime Minister David Cameron (L) eats a hot dog with New York City Mayor Michael Bloomberg outside Penn Station in New York July 21, 2010.
New York City Mayor Michael Bloomberg (L) rides the subway back to City Hall with his daughter Emma Bloomberg (2nd R) and Deputy Mayor Patty Harris (3rd R) following his final State of the City speech at the Barclays Center in Brooklyn, New York, February 14, 2013. Bloomberg proposed a ban on Styrofoam, the substance commonly used for take-out food containers that is almost impossible to recycle.
U.S. President Barack Obama (R) and former New York Mayor Michael Bloomberg look at the faces of those who died during the 9/11 attacks at the National September 11 Memorial Museum in New York May 15, 2014. The museum, memorializing the September 11, 2001 attacks, opens this week to victims' family members and next week to the public, displaying artifacts from mangled columns recalling the enormity of that fateful day to shattered eyeglasses recalling its personal pain.
Former New York City Mayor and possible 2020 Democratic presidential candidate Michael Bloomberg greets co-owner Susan O'Donnell at Harvey's Bakery and Coffee Shop in Dover, New Hampshire, U.S., January 29, 2019.
Former U.S. President Bill Clinton (R) offers his hand to former New York City Mayor Michael Bloomberg (L) after acknowledging him in his speech during the inauguration ceremony for New York City Mayor Bill de Blasio in New York on January 1, 2014. Sitting between Clinton and Bloomberg is American celebrity cooking show host Sandra Lee and New York Governor Andrew Cuomo. De Blasio was formally inaugurated as New York City's 109th mayor on Wednesday at a City Hall ceremony where he promised to take "dead aim" at closing the affordability gap he has decried as New York's tale of two cities.
Bloomberg's entry further clouds 2020 U.S. Presidential race