Labor unions want to know how the Trump administration plans to restore the agency’s authority over data, according to a letter sent Tuesday by the American Federation of Labor.

The letter says that Trump administration officials have failed to outline the administration’s strategy for restoring the agency, and said it has not been clear how it plans to use the agency for data protection.

The federal government’s data protection rules require that data be protected against unauthorized access, but not to “interfere with the operation of a system that is used to collect or process data.”

Labor unions have warned the administration that it would be a serious infringement on the agency authority to protect the privacy of its members.

The Labor Department did not immediately respond to a request for comment.

The AFL-CIO also has complained about Trump’s decision to withdraw the data protection authority from the Labor Department.