https://arstechnica.com/information-technology/2019/11/nikki-haley-lost-her-password-so-she-sent-sensitive-info-over-unclassified-system/

Former US Ambassador to the United Nations Nikki Haley sent sensitive material over a network reserved only for unclassified material because she forgot her password for classified communications, The Daily Beast reported.

The event happened on July 4 and July 5, 2017, after North Korea had tested an intercontinental ballistic missile capable of hitting Alaska. As she and her staff scrambled to draft a statement responding to the test, Haley reportedly used her BlackBerry 10 to trade comments over the OpenNet, a State Department network for communicating sensitive, but not classified, information.