Mayor Bill de Blasio Thursday huddled inside Gracie Mansion with a dozen progressive leaders from around the country and brainstormed ways to promote their agenda at all levels of American politics.

De Blasio said that next month, the group would release a list defining its program in the mold of then-Rep. Newt Gingrich's 1994 "Contract with America" -- except this one will promote left-of-center policies.

"All of this is focused on the notion that we are not having the discussion of income inequality in this country, and we are not having that discussion at our peril," de Blasio said after emerging from the private session with his wife, Chirlane McCray, and members of the group to address reporters.

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The session marked another pivot to a stage beyond the five boroughs for de Blasio.

In September, he addressed a British Labour Party conference in Manchester, England. Later this month, he plans to travel to Iowa -- which will be center stage next January for the 2016 presidential race -- as well as Nebraska and Wisconsin.