Bloomberg Philanthropy creates a program backing inventive policies at the city level, giving mayors a national role: https://www.nytimes.com/2017/06/25/us/politics/michael-bloomberg-mayors-trump.html?elqTrackId=386fb0c582484c93ba3be1f0fe23960a&elq=f28c6adcf6884652a5251f2dba116d52&elqaid=14525&elqat=1&elqCampaignId=6120