A U.S. federal court has issued a strongly worded ruling blocking a federal grand jury subpoena directed at the Federal Reserve and its Chair Jerome Powell. The subpoena was part of a criminal investigation. This decision is seen as a significant setback for the Department of Justice's investigative efforts and could indirectly influence the outlook for U.S. monetary policy.

Following the unsealing of the court documents on Friday, a federal prosecutor stated that the court's decision lacked legal foundation, effectively granting Powell "immunity protection." The ruling may also prolong Powell's tenure as Fed Chair on a political level. Republican Senator Thom Tillis of North Carolina has indicated he will block the confirmation process for nominee Kevin Warsh until the federal investigation is concluded. If Tillis maintains his opposition, a deadlock could occur in the Senate Banking Committee, preventing the nomination from proceeding to a full Senate vote. Analysts suggest this political maneuvering could keep Powell in his role at least until his term expires next May.

In the ruling, U.S. District Judge James Boasberg, overseeing the case, noted that existing evidence suggests the prosecution's investigation was motivated by a desire to pressure Powell regarding interest rate policy, rather than being based on actual evidence of criminal activity. Judge Boasberg wrote, "Did the prosecution issue these subpoenas for a proper purpose? The court finds it did not." He further stated there was substantial evidence that the primary, if not sole, purpose of the subpoenas was "to harass and pressure Powell, either to force him to acquiesce to the President or to resign so that a Fed Chair willing to act according to the President's wishes could be appointed." He also noted the government provided no evidence Powell had committed any crime, "apart from having displeased the President."

The prosecution's investigation was reportedly focused on a multi-billion dollar renovation of the Fed's headquarters in Washington and Powell's previous testimony before the Senate Banking Committee regarding the project.

The prosecutor strongly criticized the ruling at a press conference on Friday, calling the court's decision "entirely wrong" and reiterating the Justice Department's intention to pursue an appeal. Concurrently, Senator Tillis stated on a social media platform that the ruling demonstrates the criminal investigation into Powell was "both weak and absurd," characterizing it as a "failed attack on the Federal Reserve's independence." The Federal Reserve declined to comment on the matter.

Market analysts note this legal dispute could indirectly affect U.S. monetary policy prospects. The former President had repeatedly called for the Fed to lower interest rates further, but Powell had not adopted the more aggressive rate-cutting actions desired by the administration. If Powell remains in his position, the Fed's policy stance is likely to remain relatively cautious.

Additionally, conflict in the Middle East has complicated the monetary policy environment. Soaring energy prices could increase inflationary pressures, potentially reducing policymakers' willingness to cut rates in the near term. Recently, several Fed officials have expressed relatively cautious views, with only Governors Michelle Bowman and Christopher Waller explicitly supporting further rate cuts.

In markets, investors have significantly pushed back their expectations for rate cuts. Current market consensus suggests the earliest the Fed might cut rates could be late this year, whereas before the outbreak of conflict, markets had anticipated at least two rate cuts within the year.