On June 6, 2016, the FBI interviewed an unidentified individual who told agents he was contacted by a senior staff member on the Senate Judiciary Committee about concerns that data from Clinton's private server might end up overseas. According to the FBI summary, the Senate staffer wanted the witness to "determine if there was an intrusion into Clinton's server and, if so, whether exfiltrated data fell into the hands of a foreign power."
The search uncovered hundreds of files that the witness believed to be from Sidney Blumenthal’s server on a server in Romania. These files included Microsoft Word, Excel and other documents, but no emails. Blumenthal’s email account was breached by the Romanian hacker Guccifer.