The Secretary reserves the right in the Secretary’s discretion, to waive any provision(s) of these regulations in any case or class of cases for the convenience of a GSE, the United States, or in order to relieve any person(s) of unnecessary hardship, if such action is not inconsistent with law, does not adversely affect any substantial existing rights, and the Secretary is satisfied that such action will not subject a GSE or the United States to any substantial expense or liability.