U.S. stocks are drifting Monday ahead of potential flashpoints looming later in the week that could bring more sharp swings for financial markets. The S&P 500 was virtually unchanged in morning trading,

U.S. stocks are giving back some of their big recent gains Monday, ahead of potential flashpoints later this week that could bring more sharp swings for financial markets. The S&P 500 was down 0.8% in afternoon trading and on track to break a four-day winning streak.