Jerome Powell did not sign up to be America’s most reluctant facilities manager. Yet somehow, thanks to Donald Trump, the man in charge of the US Federal Reserve now finds himself accused of botching the construction and upkeep of Fed buildings.On paper, the complaint is about bricks and mortar. In reality, it is about interest rates. Trump wants them lower, and he wants them soon. The lawsuit threat over building management is simply the latest flourish in a long-running campaign to turn the Fed into another lever of presidential policy.