In his former position, Laufman would have been involved and hold knowledge of the FISA “Title-1” surveillance program initiated on target Carter Page and the “incidental” Trump campaign officials. Laufman would also have close contact with former Asst. Deputy Attorney Bruce Ohr; husband of Fusion GPS employee Nellie Ohr.
Additionally, as a result of his specific responsibilities David Laufman would also have been involved in any FARA investigations of General Mike Flynn (Turkish lobbying), and/or Paul Manafort (Ukraine lobbying); and had access to FISA-702(16)(17) database use for incidental surveillance and subsequent unmasking etc.
National Security Division head John P Carlin resigned around the same time as the Carter Page FISA warrant application was submitted, October 21st, 2016. National Security Division head Mary McCord replaced Carlin, and she resigned shortly before Special Counsel Robert Mueller was assigned May 17th, 2017.
https://theconservativetreehouse.com/2018/02/08/doj-national-security-division-official-david-laufman-quits/