Since his return to office last year, Trump has accused the chair of the US central bank, Jerome Powell, of mishandling the economy and driving up debt costs for the government by keeping interest rates too high.
But his interventions at the bank have not been limited to social media complaints.
In August, Trump moved to sack a top policymaker, Lisa Cook, a decision now being challenged at the Supreme Court.
Then on Sunday, Powell said the Fed was facing a criminal probe from the Department of Justice, relating to cost overruns at a property renovation - concerns that Powell has dismissed as "pretext".
Market reaction to the drama has remained muted, which analysts said was a sign that investors expect the bank to be able to continue operating freely.
But that faith will be tested in the coming weeks, when the Supreme Court is due to hear arguments about Cook's firing and the president is expected to announce his pick to replace Powell, whose term as Fed chair ends in May.


