In an obscure corner of the Ronald Reagan International Trade Building, a debate is underway about how to tell the story of the EPA’s history and mission.

A miniature museum that began as a pet project of former EPA administrator Gina McCarthy has come under scrutiny. It features the agency’s work over 4½ decades, with exhibit topics such as regulating carbon dioxide emissions and the Paris climate accord. The Obama administration championed such efforts, but President Trump’s policies are at odds with them.

Now the museum, which opened just days before President Barack Obama left office, is being reworked to reflect the priorities of the Trump administration, an effort that probably will mean erasing part of the agency’s history.

Unlike other stark changes that have taken place at the EPAsince Trump took office, the museum overhaul has not been primarily driven by political appointees. Rather, some of the same career staff members who worked on the exhibits under the Obama administration informed Trump appointees about the museum and the fact that parts of it were not in line with their vision.