The rupee opened weak against the dollar on Wednesday after United States said it will withdraw from the nuclear deal withh Iran which could have adverse consequences on oil prices. India which imports 80pc of its crude oil requirements face the risk of worsening macroeconomic parameters if crude prices rise. The rupee opened 0.4pc or 28 paise weak against the dollar as compared to Tuesday close of 67.08 a dollar. The Indian currency was one of the worst performers among Asian peers on Wednesday.