But there was an issue with a low-level FBI lawyer who altered an email to the Justice Department as part of the process for renewing the FISA warrant, which expires after 90 days. One of the attorneys in the National Security Division, which handles wiretap applications under the Foreign Intelligence Surveillance Act (FISA), asked the lawyer if he could document a certain claim, the officials said. He misled them when he said he could and, to cover his tracks, he altered the email, the officials said. The serious error in judgment led to his removal from the bureau, and his case has been referred for criminal investigation, officials said.