Trump released the heavily tainted Republican memo that he claims exonerates him of collusion allegations even though the FISA warrant has nothing to do with the special prosecutor's investigation of collusion & obstruction of justice. They just wanted to put surveillance on someone suspected of having possibly illegal ties to Russia.
Now he refuses to release the Democrat's rebuttal to that memo. He is afraid to let us see the rebuttal because it shows what was wrong with the original Nunes memo.
He doesn't want the American people to see both sides of the story, just his side. He is afraid that we won't agree with the version he wants us to believe. His very actions would lead any person of normal intelligence to believe that there is something he wants very much to hide from us.
This may not be obstruction of justice in the legal sense but it sure is obstruction of justice in the moral sense.
But it's been pretty obvious for a while that Trump has no problem with morals. He has none, especially when it comes to getting his way. I'll bet he envies Putin for being able to just assassinate anybody that opposes him.