The Nasdaq composite lost 3 percent and S&P 500 dropped more than 2 percent. Much of the damage came from pharmaceutical and biotech stocks after Democratic lawmakers on Monday attacked "massive" price increases of two heart drugs from Canada's Valeant Pharmaceuticals International Inc, which tumbled 16.5 percent.
The Nasdaq biotechnology index. NBI fell 6 percent, its worst one-day drop since 2011, adding to losses from last week when Democratic presidential candidate Hillary Clinton criticized drug pricing. Among the S&P sectors, the health care index .SPXHC was the deepest decliner, down 3.84 percent.
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