[Meet the New Boss]

Normally, giving someone immunity from prosecution is to encourage or require them to testify against a bigger fish.

In the Banana Republic of Barack Obama, Loretta Lynch and James Comey, giving someone immunity is to protect them from prosecution by President Trump and Attorney General Giuliani or Christie.

[MortMan]

If the immunity deal serves no valid law enforcement purpose, is it binding on subsequent agency leadership?

[fhayek]

They gave immunity to Bryan Pagliano and Paul Combetta over the email deletions. Far from advancing the investigation (as immunity is supposed do), it effectively shut them up and erected a dead-end to the investigation. It is a stonewalling strategy used by this corrupt regime. Nothing more. Like you say, it will give a Trump administration Justice Department a more difficult task to prosecute. On the other hand, maybe this is tipping off that they are getting more and more worried that Trump is actually going to win the election.