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Which is to say that Trump is such a skinflint that hed rather risk McGahn telling Congress that, yes, the president personally directed him to commit obstruction of justiceto fire Robert Mueller and then to create a fake paper trail to suggest that Trump never asked him to do thatthan have to shell out his own money to try to stop it!

So thats one legal wall Trump has run into. And yes, it matters. If the facts stated in the Mueller Report are correct, and McGahn fesses up to them, it may not make any difference to the January 6 crowd, but we will have a presidents legal counsel on the record saying that the president obstructed justice. Thats a big deal.

The second and more prominent wall, of course, was the Supreme Court, which needed about three seconds to decide that Trumps accountants did indeed have to turn over his tax returns to Manhattan District Attorney Cyrus Vance.

The courts original ruling was delivered last July, at which time even Trump appointees Neil Gorsuch and Brett Kavanaugh joined a seven-justice majority concurring with Chief Justice John Robertss ruling that no citizen, not even the president, is categorically above the common duty to produce evidence when called upon in a criminal proceeding (Clarence Thomas and Samuel Alito dissented). In February, the court denied Trumps emergency request to block a subpoena for the returns, ending the matter. This time, no dissents were publicly noted.

Go here to read the rest:
Don McGahn's Testimony Could Finally Break Donald Trump's Ability to Evade the Law - The New Republic