And a champion take on genealogy.
The disaster made Flint an American symbol of governmental mismanagement,with residents fearing their children had suffered permanent harm from lead-contaminated water.
Prominent Republicans and usually supportive media outlets have criticised Trump for spreading unfounded conspiracy theories about the death of a Florida woman.
Moore said the footage was left out of Fahrenheit 11/9 - his recent documentary about the rise of Trump.
Filmmaker Michael Moore's new documentary Fahrenheit 11/9 explores the political and social aftermath of Trump's election.
Michael Moore has returned to the spotlight to reassure everyone he isn't pulling any punches.