On February 27, 2017, Green founded and ran the Twitter handle @ShadowingTrump [see ShadowingTrump.org]"to daily debunk Trump and propose progressive alternatives." His "Shadow Cabinet" of 21 included such national progressive leaders as Laurence Tribe as attorney general, Robert Reich as secretary of labor, Diane Ravitch as Education Secretary, Rashad Robinson as "Secretary of Justice Issues, Marielena Hincapie of the National Immigration Law Center as Immigration Secretary. Renamed @ShadowingDC in 2021, it had 68,000 followers by April 2021.
