When legal drama arises in Washington, the longtime defense lawyer Abbe Lowell often has a piece of it. No stranger to the limelight, he is eagerly stepping into it in President Trump’s second term, with a client list of administration targets growing by the week.

His latest addition is among his most consequential: Federal Reserve governor Lisa Cook, who is fighting Trump’s attempt to fire her, a battle that could have long-term ramifications for the central bank and for the scope of presidential power.