Several Republican congressmen have written to U.S. Export-Import Bank President Fred Hochburg, asking some probing questions about the business plan the bank submitted to Congress last month. They rightly express concern about the bank’s operations and risk management. They also cite the nondiversified portfolio of the bank, with its high reliance on the aircraft sector (which has long been about half of the bank’s exposure) singled out for particular concern. The letter, in short, gives a good indication of where bodies are buried at Ex-Im.