McCarthy has supported the DOJ in every witch-hunt against Trump over the past seven years. For in his mind, the DOJ is honest and principled and would not even be investigating Trump unless they had solid evidence. Even as he wrote the book “Ball of Collusion” setting out the evidence that the Russia/Trump election collusion was false (in his book he missed several important points of the DOJ’s crooked actions), he still supported the DOJ/FBI’s search for evidence of a crime.
I have little trust in McCarthy’s legal opinions in regards to Trump. He is biased in favor of those for whom he previously worked.