Fed governor Lisa Cook is seeking a temporary restraining order against the president’s attempt to fire her

Donald Trump’s battle to exert control over the Federal Reserve faces a key legal test today, with a governor of the central bank seeking a temporary block on his extraordinary attempt to fire her.

Lisa Cook sued the US president on Thursday, with her lawyers describing his attempt to dismiss her as “unprecedented and illegal”, and based on “pretextual” allegations.

The case is widely expected to be ultimately decided by the supreme court. While it makes it way through the courts, Cook is seeking a temporary restraining order against Trump’s attempt to “immediately” dismiss her from the Fed’s board.

A hearing on the motion is set for 10am in Washington on Friday. The case has been assigned to US district judge Jia Cobb, an appointee of Joe Biden.