The committee is asserting a right to go after whomever it wants and to scoop up whatever evidence it wants. From Glenn Greenwald at greenwald.substack.com:
The Committee plotted with JPMorgan and its lawyer, former Obama AG Loretta Lynch, to obtain a citizen’s financial records with no possibility of judicial review.
In its ongoing attempt to investigate and gather information about private U.S. citizens, the Congressional 1/6 Committee is claiming virtually absolute powers that not even the FBI or other law enforcement agencies enjoy. Indeed, lawyers for the committee have been explicitly arguing that nothing proscribes or limits their authority to obtain data regarding whichever citizens they target and, even more radically, that the checks imposed on the FBI (such as the requirement to obtain judicial authorization for secret subpoenas) do not apply to the committee.
As we have previously reported and as civil liberties groups have warned, there are serious constitutional doubts about the existence of the committee itself. Under the Constitution and McCarthy-era Supreme Court cases interpreting it, the power to investigate crimes lies with the executive branch, supervised by the judiciary, and not with Congress. Congress does have the power to conduct investigations, but that power is limited to two narrow categories: 1) when doing so is designed to assist in its law-making duties (e.g., directing executives of oil companies to testify when considering new environmental laws) and 2) in order to exert oversight over the executive branch.
What Congress is barred from doing, as two McCarthy-era Supreme Court cases ruled, is exactly what the 1/6 committee is now doing: conducting a separate, parallel criminal investigation in order to uncover political crimes committed by private citizens. Such powers are dangerous precisely because Congress’s investigative powers are not subject to the same safeguards as the FBI and other law enforcement agencies. And just as was true of the 1950s House Un-American Activities Committee (HUAC) that prompted those Supreme Court rulings, the 1/6 committee is not confining its invasive investigative activities to executive branch officials or even citizens who engaged in violence or other illegality on January 6, but instead is investigating anyone and everyone who exercised their Constitutional rights to express views about and organize protests over their belief that the 2020 presidential election contained fraud. Indeed, the committee’s initial targets appear to be taken from the list of those who applied for protest permits in Washington: a perfectly legal, indeed constitutionally protected, act.