The National Air Traffic Controllers Association on Friday sued the Trump administration over the continued partial government shutdown, saying airline controllers are being deprived “of their hard-earned compensation without the requisite due process.”

“Controllers are responsible for ensuring the safe routing of tens of thousands of flights, often working lengthy, grueling overtime shifts to do so. In fact, plaintiffs’ job is so demanding and requires such rare skills that the FAA struggles to maintain a full complement of certified Air Traffic Controllers, even under normal circumstances,” according to the complaint, filed by the Washington firm Woodley & McGillivary.