Fed watchers were alarmed by a 31 January letter to Fed chair Janet Yellen from Representative Patrick McHenry, the vice-chairman of the House committee on financial services. McHenry did not pull his punches. “Despite the clear message delivered by President Donald Trump in prioritising America’s interest in international negotiations,” McHenry wrote, “it appears that the Federal Reserve continues negotiating international regulatory standards for financial institutions among global bureaucrats in foreign lands without transparency, accountability, or the authority to do so. This is unacceptable.” In her reply of 10 February, Yellen firmly rebutted McHenry’s arguments. She pointed out that the Fed does indeed have the authority it needs, that the Basel agreements are not binding, and that, in any event, “strong regulatory standards enhance the stability of the US financial system” and promote the competitiveness of financial firms. But that will not be the end of the story. The battle lines are now drawn, and McHenry’s letter shows the arguments that will be deployed in Congress by some Republicans close to the president. There has always been a strand of thinking in Washington that dislikes foreign entanglements, in this and other areas. While Yellen’s arguments are correct, the Fed’s entitlement to participate in international negotiations does not oblige it to do so, and a new appointee might argue that it should not.