The euro dropped to its lowest level in 6-1/2 months against the greenback on Monday as investors worried about possible U.S. tariffs that would hurt the euro area's economy. Meanwhile the U.S. dollar index -- a measure of its value relative to a basket of foreign currencies -- slightly overshot the highs seen right after the U.

The euro hit a 4-1/2-month low against the U.S. dollar as investors worried about possible U.S. tariffs which would hurt the euro area's economy. The greenback was within striking distance of the levels seen right after the U.