"In a Jan. 20 memo, White House Chief of Staff Ron Klain instructed the heads of executive departments and agencies to place a hold on all recently issued rules and regulations.... With respect to rules that have been sent to the Office of the Federal Register but not published, the memo advises agency heads to immediately withdraw them pending review and approval. And with respect to rules that have been published in the Federal Register or that have been issued in any manner, but have not taken effect, Klain advises that department heads should consider postponing the rules' effective dates for 60 days."