President Trump unveiled plans Tuesday to launch a government-run website, dubbed TrumpRx, for consumers to buy drugs directly from manufacturers, and he said Pfizer plans to offer some of its drugs on the site at a reduced rate. Separately, Trump said Pfizer would offer all of its drugs to Medicaid at a reduced, “most favored nation” price, as well as introduce any new drugs to the U.S. market at the reduced prices. In return, the company gains a three-year grace period to exempt it from...