I've read as much info as I cared to on this from left and right sources. I'm all for congress looking into it. What would bother me is if Grassley knew since he read the document already, was playing ignorant to build up a lot of inuendo for political reasons. When he was asked about if there was anything to the allegations, he demurred by saying it's really not up to him to decide. That tells me it's likely nothing as I know had there been something there he wouldn't have been able to contain himself
“Let’s put it this way. There’s accusations in it, but it’s not for me to make a judgment about whether these accusations are accurate or not,” Grassley said of the FD-1023 file. “It’s my job to make sure the FBI is doing their job, and that’s what this is all about, as far as I’m concerned. The public’s business ought to be public.”
I don't know but to me it sounds like a distraction from Trumps indictment.