(Bloomberg) US Supreme Court justices suggested they are wary of President Donald Trump’s effort to fire Federal Reserve Governor Lisa Cook over unproven mortgage-fraud allegations, saying the move could upend the Fed’s independence and rattle markets.

Hearing arguments in Washington Wednesday, conservative and liberal justices alike sharply questioned US Solicitor General D. John Sauer, who urged the court to let Trump oust Cook for the time being while her lawsuit goes forward.

Trump’s own appointees were among the skeptics. Justice Brett Kavanaugh said the president’s position would “weaken if not shatter the independence of the Federal Reserve.” Justice Amy Coney Barrett asked whether the risk to financial markets was reason for “caution on our part,” though she also suggested she wasn’t ready to fully embrace Cook’s position.

The case is testing the Supreme Court’s commitment to the independence of the central bank. The court so far has helped shield the Fed from Trump’s efforts to seize control, but the Cook case presents a new set of legal issues.

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