Year of the Boomerang, Baby!
The ink was still drying on special counsel Robert Mueller's appointment papers when his chief deputy, the famously aggressive and occasionally controversial prosecutor Andrew Weissmann, made a bold but secret overture in early June 2017.
Weissmann quietly reached out to the American lawyers for Ukrainian oligarch Dmitry Firtash with a tempting offer: Give us some dirt on Donald Trump in the Russia case, and Team Mueller might make his 2014 U.S. criminal charges go away.
The specifics of the never-before-reported offer were confirmed to me by multiple sources with direct knowledge, as well as in contemporaneous defense memos I read.
https://thehill.com/opinion/white-house/454185-how-mueller-deputy-andrew-weissmanns-offer-to-an-oligarch-could-boomerang