I don't know if it is just about the Mueller documents. I think it is more about what Mueller did not investigate. Which was by design. He was asked to investigate evidence that was largely made up by Brennan, Comey, Steele, and Hillary's inner team - he was never going to find anything real.
But I do think Trump is hitting too close, there is something exceptionally wrong with Hunter Biden getting all those deals. Biden intervened to protect a Ukrainian oligarch by threatening to withhold the aid. There's a lot more going on here they don't want uncovered (and this would probably include some in the GOP). Trump asked for 2 things - find out Ukraine's role in the DNC hacking scheme and what's the real story behind Biden interfering with Burisma investigation. Why does Trump relate these two issues is the question people should ask. Why did Biden intervene to protect Burisma? For a mere $1 million to his kid? I doubt it. Much more than that going on. Where does this road lead?
Trump wants his political payback for the Russia Hoax and that road probably leads to the uncovering of all kinds of corruption. Look how quickly they brushed the entire Awan Brothers scandal away. George Papadoupolos got more prison time (10 days) than the Awans who only got 90 days supervised released. Look how they dismiss Biden's blackmail, defend Hunter's deals as 'groundless innuendo' and get all aghast for weeks on end at any kind of distraction they get their hands on. IMO it's much more than just Mueller. It's the entire swamp game that will unravel like a knit sweater if Trump pulls on too many strings.
We'll see what Barr and Durham end up doing.
Something very bad was going on in Ukraine in 2015-2016, removal only became possible when Trump opened the issue, undoubtedly it’s not Democrats alone.
Where did the cash that went to Iran come from?