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Complete ruling. politico.com/f/?id=0000016e-a4c4-d442-a...
Its a good read if you have the time, otherwise is here excerpt from the ruling that gets to core of it.
For present purposes, all this means is that, when a committee of Congress seeks testimony and records by issuing a valid subpoena in the context of a duly authorized investigation, it has the Constitution’s blessing, and ultimately, it is acting not in its own interest, but for the benefit of the People of the United States. If there is fraud or abuse or waste or corruption in the federal government, it is the constitutional duty of Congress to find the facts and, as necessary, take corrective action. Conducting investigations is the means that Congress uses to carry out that constitutional. Thus, blatant defiance of Congress’ centuries-old power to compel the performance of witnesses is not an abstract injury, nor is it a mere banal insult to our democracy. It is an affront to the mechanism for curbing abuses of power that the Framers carefully crafted for our protection, and, thereby, recalcitrant witnesses actually undermine the broader interests of the People of the United States. Thus, DOJ’s hand-waving over the Judiciary Committee’s purported failure to establish a “cognizable” injury for standing purposes (Def.’s Mot. at 36–40) masks the substantial harm that results from an Executive branch official’s defiance of a congressional subpoena. But it is hard to imagine a more significant wound than such alleged interference with Congress’ ability to detect and deter abuses of power within the Executive branch for the protection of the People of the United States.