The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.
Chairman Schiff took it upon himself to subpoena phone records of a number of people, including a journalist (with first amendment issues) and a person he knew to be a practicing attorney (which has been established as a violation of the attorney client privilege), without probable cause. At the time he issued the subpoena, no impeachment resolution had been passed by the House, which arguably means he did so solely under Congress's authority to subpoena in connection with legislation (though no legislation was contemplated). Even if done pursuant to an impeachment, the subpoena would radically exceed the power of the DOJ to obtain a subpoena. The DOJ would be rightfully castigated for subpoena's of journalists records trying to catch leakers for example, particularly if they didn't have probable cause and couldn't grab an attorney's records without a judge signing off.
AT&T granted the information to Schiff, notwithstanding that there is no authority at law for them to do so. The statute permits them to share only with consent of the person whose records are sought or to federal investigators in the law enforcement agencies (there is no Congressional right at law).
He did this in secret, which prevented the rightful aggrieved persons from challenging his actions. He did this without probable cause or any judicial review. As used by Schiff, Congress apparently has the unbrideled power to investigate someone looking for a crime on a fishing expedition, violating any rights or laws they want and all historical norms, and then release that information publicaly, where presumably any prosecutor, state or federal, is free to take notice of it even though it would have been illegal for them to collect it.
So is there still a fourth amendment?