When he was still President the right wing talk show host Bill Cunningham (was a loyal Trump supporter, now doesn’t care as long as GOP wins) said the Left was itching to find some record such as a complicated real estate site deal in which Trump signed a foot tall pile of papers an aide told him was cleared and accidentally said he knew there was no prior contested deed or lien on something and then would be called a liar in court. And in trouble.
Wasn’t far off if they look at all his financial records.
The want to know who he does business with so they can conduct lawfare against them, too.