Dow Futures Flat, Dollar Sips as Trade Concerns Trim Risk Appetite Ahead of G20

U.S. stock futures retreat, dollar wanes as investors peel back from recent equity market highs and take a defensive stance on risk ahead of this weekend's G20 Summit in Japan. Global oil prices edge lower following yesterday's sanctions on the Iranian leadership and suggestions that the U.S. military presence in the Gulf could abate over the coming months. U.S. equity futures drifted lower Tuesday, setting up the S&P 500 for its first three-day decline since early May, as investors peel back from recent record highs and take a defensive stance on risk ahead of this weekend's G20 Summit in Japan.