Last week, several news outlets obtained financial records showing that Michael Cohen, President Trump’s personal attorney, had used a shell company to receive payments from various firms with business before the Trump Administration. In the days since, there has been much speculation about who leaked the confidential documents, and the Treasury Department’s inspector general has launched a probe to find the source. That source, a law-enforcement official, is speaking publicly for the first time, to The New Yorker, to explain the motivation: the official had grown alarmed after being unable to find two important reports on Cohen’s financial activity in a government database. The official, worried that the information was being withheld from law enforcement, released the remaining documents…

Seven former government officials and other experts familiar with the Treasury Department’s fincen database expressed varying levels of concern about the missing reports. Some speculated that fincen may have restricted access to the reports due to the sensitivity of their content, which they said would be nearly unprecedented. One called the possibility “explosive.” A record-retention policy on fincen’s Web site notes that false documents or those “deemed highly sensitive” and “requiring strict limitations on access” may be transferred out of its master file. Nevertheless, a former prosecutor who spent years working with the fincen database said that she knew of no mechanism for restricting access to sars. She speculated that fincen may have taken the extraordinary step of restricting access “because of the highly sensitive nature of a potential investigation. It may be that someone reached out to fincen to ask to limit disclosure of certain sars related to an investigation, whether it was the special counsel or the Southern District of New York.” (The special counsel, Robert Mueller, is investigating Russian interference in the 2016 Presidential election. The Southern District is investigating Cohen, and the F.B.I. raided his office and hotel room last month.)