Jeremy Mohler, on behalf of “In the Public Interest,” explains why charter schools are a perfect fit for the Trump administration. They are a way of disinvesting in public schools.

From rural Pennsylvania to Nashville to Oakland, charter schools are taking already limited education funding, forcing local school boards to make difficult choices about what to cut at traditional, neighborhood schools to make up the difference. They cost the San Diego Unified School District $65.9 million last year, alongside $124 million in budget cuts the district was forced to make, including laying off teachers and slashing preschool.

Here’s how it works: when a student transfers to a charter school, all the funding for that student leaves with them, while all the costs do not. The student’s old school can’t lower it’s heating bill, make its principal part-time, or pay a teacher less because she has one less student.

“What’s happened with the proliferation of so many charter schools is that sometimes it just becomes a parallel school district and actually bleeds away money from neighborhood schools,” said John Lee Evans, a board trustee for San Diego Unified School District.

By supporting charter schools—and requesting more charter school funding in the federal budget—Trump has thrown his weight behind making the status quo even worse. And that’s on top of the tax cuts he helped usher through Congress earlier this year, which overwhelmingly benefit corporations and the wealthy, and could very likely force Washington to cut education spending even more.

Of course, the president isn’t alone. Democratic mayors in cities like Chicago and Washington, D.C., have embraced charter schools to sidestep criticism and teacher demands for better pay and more student resources.