Senators ask CEOs why their drugs cost so much more in the U.S.

Sen. Bernie Sanders : "Those drugs do nothing for anybody who cannot afford it" Merck 's cancer drug Keytruda costs $ 100,000 more in the U.S. than it does in France .

Merck CEO Robert Davis : "Their negotiating strength has increased dramatically" Drugmakers say they pay more for drugs but also get new drugs faster.

The report showed that these companies make more money selling their popular drugs in the U.S. than selling them in the rest of the world combined. The report also found that while some drug prices climb in the U.S. , they go down or stay the same elsewhere..