Federal Reserve Chair Jerome Powell in a Thursday letter countered criticisms leveled at the central bank by a top White House official over a $2.5 billion renovation project.

Russell T. Vought, the head of the Office of Management and Budget, said he and other administration officials wanted access to the Fed’s building in Washington.

Federal Reserve Chair Jerome Powell has asked the central bank’s inspector general to conduct an additional review of an ongoing $2.5 billion renovation of the institution’s headquarters that has drawn fire from President Donald Trump and others,

Amid a fresh set of attacks on Fed Chair Jerome Powell came reports that President Donald Trump might fire the central banker. Increasingly, Trump is frustrated with Powell for not lowering interest rates already.

If President Donald Trump takes the unprecedented step of trying to fire Fed Chairman Jerome Powell, the effort would roil markets and likely be met with pushback in the courts. Trump and the Trump administration have increasingly turned their fire on Powell and his leadership of the central bank.