The school district told the San Francisco Examiner that this is an optional resource. It was put out by the teachers union, the United Educators of San Francisco.
"Let us please not sidestep the fact that a racist and sexiest man has become the president of our country by pandering to a huge racist and sexist base," the union said in a statement.
The author of the lesson plan, Fakrah Shah, calls Trump a racist and sexist man and says teachers have a role to play to help students make sense of the new reality.
The full lesson plan is here.