I guess I should add some stuff about the book: house of trump : house of putin.

The author have over 1000 source notes and researches the trump affiliation of Trump with Putin back over the last 30 years.

The author is also on twitter:
https://twitter.com/craigunger?ref_src=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Eauthor