Members of the group, which calls itself Cult of the Dead Cow, protected O’Rourke’s secret for decades, reluctant to compromise the former Texas Congressman’s political career.

After more than a year of reporting, Menn persuaded O’Rourke to talk on the record. In an interview in late 2017, O’Rourke acknowledged that he was a member of the group, on the understanding that the information would not be made public until after his Senate race against Ted Cruz in November 2018.