IMHO all of this could be nothing more than a phishing expedition. I still have not see any evidence that Paul is in a heap of trouble.
https://www.washingtonpost.com/politics/manafort-offered-to-give-russian-billionaire-private-briefings-on-2016-campaign/2017/09/20/399bba1a-9d48-11e7-8ea1-ed975285475e_story.html
uh-oh...