The Australian dollar's surprising resilience in the face of the hit to market sentiment from U.S. tariffs is raising questions whether its long-standing role as a proxy for risk is ending. The breakdown in that correlation is slowing trade in the Aussie, hurting Australian investors in the U.S., and highlighting how U.S. President Donald Trump is rocking the pillars of financial markets. It is a consequence of an unusual turn in the U.S. dollar, which, says Bank of America currency strategist Oliver Levingston, has shot lower together with stocks for only the third time in 25 years.