You’ve never seen a fight until you’ve seen a fight over school closures. And Mayor Vince Gray and D.C. Schools Chancellor Kaya Henderson may have quite the fight ahead of them.

WJLA reports that Gray and Henderson announced today that they may shutter more D.C. public schools next year, following in the footsteps of former Chancellor Michelle Rhee, who closed 23 schools early in her tenure:

Speaking at a news conference at the Wilson Building alongside D.C. Public Schools Chancellor Kaya Henderson, Gray said the city has too many schools and some of them are going to be closed. He said that the city is only averaging about 300 students per school.

“What we have is unsustainable, ” Mayor Gray said. “When you put DCPS with public charter schools, you have 220 buildings. It’s not sustainable.”

The mayor said that compared to surrounding jurisdictions, including Fairfax, Montgomery and Prince George’s counties, D.C. has more schools and fewer students than each.

Last year Henderson noted that some 40 public schools have fewer than 300 students. And though enrollment in D.C. public schools has recently shown small increases, the number of students opting for public charter schools is growing much more aggressively. A preliminary report late last year found just over 46,000 students in DCPS, and 32,000 in charter schools. There are currently 123 public schools in the system.

The news came alongside the announcement of an ambitious five-year strategic plan for DCPS. Under the plan, Gray and Henderson said they would seek to increase math and reading proficiency (notably at the city’s 40 lowest-performing schools), increase the high school graduation rate from 52 to 75 percent, ensure that 90 percent of students like the school they attend, and increase overall enrollment.