Angered by skyrocketing drug prices, a pair of senators on Wednesday urged Congress to block companies from cornering the market on old, off-patent drugs. Sens. Susan Collins, R-Maine, and Claire McCaskill, D-Mo., released findings from a year-long investigation into companies like Turing Pharmaceuticals, which generated national outrage last year after hiking the price of a life-saving anti-infection drug by more than 5,000 percent.