On February 18, 2018, United States attorney general Jeff Sessions stated that the Department of Justice (DOJ) will investigate whether the process used by the Federal Bureau of Investigation (FBI) to obtain warrants under the Foreign Intelligence Surveillance Act (FISA) regarding allegations involving Russia and the Donald Trump presidential campaign was proper. The most notorious part of this process involved FISA Court surveillance and search warrants on part-time Trump campaign informal adviser Carter Page. The warrants were based on a dossier written by former British intelligence agent Christopher Steele.