As negative interest rates abound in Europe, foreign central banks and other investors are gobbling up U.S. Treasuries.

Critics see the hire as feeding cynicism about 'the revolving door and the pernicious outsized influence Wall Street has over regulators.'

NFA wants currency dealers to hold more capital in reserves and to expand reporting and risk management programs.

Currency is at lowest level vs. U.S. dollar since 2002, down more than 30 percent since 2012.