Where Does Congress Get Its Subpoena Power?

In Analysis by Michael Rae

In a past Catalyst article by Trevor Mauk and Jonathan Hofer, the authors cover a pending Supreme Court case, FBI v. Fazaga. The question at issue in Fazaga is whether the “District court can review contested surveillance that is protected under state secrets privilege.”
What Mauk and Hofer grapple with is the leeway the government has to withhold evidence from a legal proceeding. Another interesting corollary to this is how does the government, specifically Congress, have the power to request evidence in the form of subpoenas in their investigations?
A congressional subpoena is an official request issued by either house or committee of Congress, which

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