AUD/USD on the defensive in Asia after closing 0.1% lower on Tuesday

Weighed down by concerns over China's economy and weak commodity prices

Inability to rally despite hawkish RBA, falling U.S. yields is bearish

Strong support at 0.6642-47 , break opens 0.6620 and 0.6586

U.S. Presidential debate & RBA Asst. Governor Sarah Hunter speech eyed Wed

U.S. inflation data later Wed key, could determine size of Fed Sep rate cut

Resistance 0.6680-85, 0.6700-05; Tuesday range 0.66765-0.66415

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