The criminal investigation into Federal Reserve Chair Jerome Powell isn't ultimately about the Fed's headquarters, or Powell, or even interest rates. It's about power, writes Greg Ip.

Core Viewpoint - The investigation highlights the extent to which the president is willing to exert control over the central bank [1] Group 1 - The investigation indicates potential political interference in monetary policy decisions [1] - The president's actions may impact the independence of the central bank [1] - The situation raises concerns about the long-term implications for economic stability [1]