New documents show the pair discussing travel arrangements and UK politics in messages from 2018.
The former Trump adviser was accused of defrauding donors of $15m, though his lawyer says he did not pocket the money.
Bannon says his time in prison "not only didn’t break me, it empowered me".
Guo Wengui has been convicted of running a billion dollar scam in the US. His followers tell their stories.
The Supreme Court remains Bannon's last chance, after a federal appeals court denied a similar bid.
A US court has ordered ex-Trump campaign strategist Steve Bannon to turn himself in by 1 July.
He was convicted in 2022 for not co-operating with a congressional committee probing the capitol riot.
Steve Bannon, the right-wing media personality-turned-Trump adviser, may be heading to prison.
As part of the inquiry into Guo Wengui, the US seizes more than $630m from multiple bank accounts.
