From reddit:
As far as who is Keith Nahigian:
http://nahigianstrategies.com/approach/
Runs Nahigian strategies, a PR firm. This may be a good move. Nahigian runs Terry McAuliffe’s (D-GOV-VA) PR as well; or at least used to. VA is a swing State and Hillary’s campaign manager was McAuliffe’s manager during his election.
Basically, Donald is stealing the other team’s playbook.
Trump had to shake up his campaign. The media was mocking him.
This new guy is associated with Terry McAuliffe and that is a good move? Right.