Investors are concerned that U.S. President Donald Trump will struggle to deliver promised tax cuts and how quickly the Trump administration can implement pro-growth policies that propelled the market to record highs in recent months, with nervousness increasing ahead of a key healthcare vote. This concerns pushed stocks on Wall Street lower and kindled safe-haven demand for the Japanese currency. The US dollar dipped to a three-week low against the Japanese yen yesterday. The Dow Jones Industrial Average was down 0.81 percent at 20,737.44 points. The S&P 500 lost 0.88 percent to 2,352.60, on track for its fourth down session.