D.C. Mayor Muriel E. Bowser endorsed Democratic presidential hopeful Mike Bloomberg Thursday, calling the billionaire former mayor of New York City “the only candidate who will unify the country and defeat Donald Trump.”

Bloomberg came to Washington to deliver a speech outlining his plan to create affordable housing and ease the homeless crisis that is posing challenges for large cities across the country, including the nation’s capital.

Bowser appeared with him at the Atlas Performing Arts Center on H Street NE, a gentrifying corridor that illustrates the challenges cities face in balancing economic development and the needs of the poor.

She chose Bloomberg, a business man who served three terms as mayor, from a crowded field of candidates that includes former vice president Joe Biden, who worked closely with the District during the Obama administration and whom she has praised in the past.