Apparently, a new "tell all" book about Mike Pence is going to be released on August 28th. The title of the book is, "The Shadow President: The Truth About Mike Pence".

I don't know if the allegations presented in this book contain referenced sources or if the claims are just hearsay. Check out the sources below.

https://www.dailymail.co.uk/news/article-6094873/Mike-Pence-patiently-waiting-Trump-impeached-new-book-reveals.html

https://www.amazon.com/Shadow-President-Truth-About-Pence-ebook/dp/B07DHLFQQ4/ref=as_li_ss_tl?ie=UTF8&linkCode=ll1&tag=dmmassagers-20&linkId=08c1b45026ba47295906a53bf3da054d&language=en_US