You left off the first part of the sentence including the word "or". It's her "or" it.
His recusal letter makes that clear and it is the letter that is the controlling factor, not his testimony. The letter is very closely aligned with his testimony.
His recusal letter is similar to what he said during the confirmation hearing under oath.
Confirmation hearing:
Written statement:
And of course all DOJ actions since, on the email investigation, the Clinton Foundation, Uranium One, the dossier and the FISA warrant have been handled not by the recused Sessions but instead by the compromised Rod Rosenstein.
And when he said “that involve Secretarwy Clinton”, he preceded it with “those type of investigations”. That referred back to whatever was done during the campaign.
So, the “it” is the campaign, the the campaign is the controlling factor.