Don Trump Jr.'s FIRST testimony before Senate Intelligence Committe
The Chairman is Richard Burr. The Senate Intel Committee Chairman Burr has said several times that they hadn't found any hard evidence of "collusion" with Russia, but Burr hadn't shut the door on it completely.
They've already been investigating the Russia infiltration matter for many months, starting in 2017. They have issued decisions along the way (that Russia did interfere on direct orders from Putin), but that they hadn't found any collusion and didn't expect to.
Trump Jr. did testify before the Committee in 2018. Burr posted the testimony for the public. So here it is, with an intro article by Vox, for anyone who wants to read parts of it (it's very long, though).
So why are they having him come back? Maybe there are discrepancies between his testimony and what Mueller reported? Or maybe they want to wrap up or clarify some things?
Here is the link. In the article is the pdf of his testimony.
https://www.vox.com/policy-and-politics/2018/5/16/17360484/donald-trump-jr-transcript-senate-judiciary-committee