Equities on both sides of the Atlantic began the week in the red as Greece agreed to form a new government and Italy's Prime Minister Silvio Berlusconi denied reports he planned to resign.
In Europe, the Stoxx 600 Index closed with a 0.6 per cent drop for the day.
In afternoon trading in New York, the Dow Jones Industrial Average fell 0.75 per cent, the Standard & Poor's 500 Index dropped 0.86 per cent and the Nasdaq Composite Index shed 1.81 per cent.
Europe's sovereign debt crisis is roiling governments of troubled countries with Greece and Italy grabbing the most attention as Berlusconi struggled to maintain power ahead of a key vote in Parliament tomorrow on the 2010 budget report for the euro zone's third-largest economy.
Today's market is "solely driven by whether Italy's Berlusconi will resign or not," Peter Boockvar, equity strategist at Miller Tabak + Co in New York, told Reuters. "We will thus have another week of markets being driven by politicians."