Tito Jackson, who unsuccessfully sought to topple Mayor Marty Walsh in 2017, is wading back into politics. On Tuesday, he endorsed Kim Janey, who took over as acting mayor when Walsh left for the Biden administration in March.

“She has fought for racial, social, economic, environmental and educational justice throughout her entire career, and she brings that same spirit to City Hall,” Jackson said in a statement.

A Roxbury city councillor before he ran for mayor, Jackson’s 2017 bid for the top job in City Hall opened up his District 7 seat, which Janey won. Jackson went on to become the owner and CEO of Verdant Medical, a marijuana company.

Janey is currently the District 7 city councillor, but she is giving up the seat to run for a full four-year term as mayor. She became acting mayor due to her position as City Council president, who is elected by an internal council vote. She is the first woman and person of color to serve as the city’s chief executive.

“She will create more affordable housing and paths to homeownership, make sure our public transportation system works for the riders who depend on it every day and ensure equity and excellence for every student in the Boston Public Schools,” Jackson said.

Janey said she was “proud” to receive Jackson’s endorsement. “I witnessed first-hand the way Tito has stood up for the residents of District 7 — and all the residents of Boston — during his time on the Council and every day since.”

Janey and Jackson plan a canvassing effort on Thursday night.

Jackson first joined the council in 2011 and chaired the 13-member body’s education committee. He also worked for Gov. Deval Patrick and served as his political director during Patrick’s 2010 reelection bid.