Minnesota Gov. Tim Walz has lifted restrictions he set in March on how the malaria drug hydroxychloroquine is dispensed, saying a run on the drug is no longer feared because it has no proven benefit in treating COVID-19. President Donald Trump has repeatedly promoted the drug as a coronavirus treatment, calling it a possible “game-changer” and at one point saying he was taking it regularly to help prevent infection. That led to some practitioners, nationwide and in Minnesota, prescribing large amounts of the drug to patients and themselves, risking shortages for people who relied on the drug for other chronic...