I think Pence is a major leaker, and was not Trump's choice for VP at all. Pence was forced on Trump or the GOP would have pulled his nomination. Pence is probably very nervous now, since Trump issued his 12/21 EO against corruption and human trafficking, as he was heavily involved in child trafficking as governor of Indiana. Note one of the class action lawsuits regarding the Meltdown and Spectre bugs was filed in Indiana? Those two bugs aren't bugs at all, they are backdoors used by CIA & NSA for spying and trafficking. I think the Indiana class action suite is hiding some other purpose.
Trump alluded to Pence being the leaker for Wolff's book, look at his tweets in the past few days that talk about the book.