Former President Donald Trump‘s campaign was hacked and had confidential memos sent to some news outlets over the weekend, but the hack appears more complicated than it originally seemed.

Over the weekend, the Trump campaign confirmed that it had been hacked after Politico and the Washington Post reported they had received materials from an individual only identified as “Robert.” The mystery account sent a 271-page vetting document about Trump’s running mate, Sen. J.D. Vance (R-OH), via an AOL email account. The materials were based on publicly available information about Vance.