Workers on Thursday began restoring an exhibit on the lives of the nine people once enslaved at the former President’s House in Philadelphia amid a contentious legal fight between the city and the Trump administration.

Mayor Cherelle Parker visited the site Thursday morning and thanked the workers for their efforts, spokesperson Joe Grace said.

A federal judge had set a Friday deadline for the Interior Department to restore the exhibit on the people enslaved by George Washington at the site on Independence Mall. The U.S. Attorney’s Office declined to comment on the restoration work, a spokesperson said.