Because one of the BIG questions is why had Trump gone along with his bromance with Putin for so long, and does that have anything to do with his investments, loans, or possible compromised "positions" (British intelligence allegation) when he visited Moscow some years ago? He said he never talked with Putin, which we now know is a lie (what a surprise!
), claimed that he has no investments there (one of his sons said otherwise about a decade ago), etc.
His full tax returns could tell a large part of the
real story.