An unlikely bipartisan consensus has formed to blame pharmaceutical companies for high prescription-drug prices. Democrat Elijah Cummings, chairman of the House Oversight and Reform Committee, held hearings this month on drug companies’ pricing practices, while Republican Chuck Grassley has done the same on the Senate Finance Committee. As odd a duo as President Trump and Bernie Sanders already have called for drug price controls, and more voices will join the chorus as the public grilling of pharmaceutical executives continues.

Voters...