You'll have to be more specific about what part of my comment you're referring to as "it". Because obviously the investigation wasn't a campaign stunt.

And if you want to read about how the investigation was properly predicated, here's the IG report: https://oig.justice.gov/reports/2019/o20012.pdf

The existence and thoroughness of this report begs the question as to why the Durham investigation was ever needed in the first place.