Has to follow the rules as per:
https://intelligence.house.gov/uploadedfiles/fisa_title_i_summary.pdf
Only choices (as I see it from paragraph #2) are:
Director of the FBI: James Comey
Deputy Director of the FBI: Andrew McCabe
Attorney General: Loretta Lynch
Deputy Attorney General: Sally Yates
Assistant Attorney General for National Security: John P. Carlin
I see the date now. Missed it before for those pages.
Here's the paragraph. So, we dig to find out who was in these positions in June 2017.
"Applications to target a U.S. person under Title I must be accompanied by a certification from a
senior national security official, which may include the Director or Deputy Director of the
FBI. They must then be approved by the Attorney General, the Deputy Attorney General, or the Assistant Attorney General for National Security. If one of those officials approves an
application, it is then sent to the Foreign Intelligence Surveillance Court (FISC), which consists of judges selected by the Chief Justice of the U.S. Supreme Court who serve on a rotating basis."
No other DOJ atty would need to sign it, but since it's redacted, they might have. Better to have all the possible names than to make an assumption.
She signed earlier on, didn't she?