FBI Director James Comey admitted that a "mistake was made" with the San Bernardino investigation during a surprisingly contentious hearing held by the US House Judiciary Committee on Tuesday.
Comey and the FBI are seeking to force Apple to build custom software to access encrypted data on a terrorist's iPhone.
New York Democrat Jerrold Nadler asked Comey about whether the San Bernardino iPhone had its iCloud password changed, preventing the device from backing up to accessible Apple servers. Comey was forced to admit that the password was changed at the FBI's request, and called it a "mistake."
It wasn't the only difficult question that Comey fielded on Monday.