Senate Finance Committee Chairman Chuck Grassley said that he intends to push for a vote this year on a bill that would limit drug-price increases, even as pharmaceutical companies race to find treatments and vaccines for Covid-19. The drug industry has been pouring resources into researching new therapies as the pandemic wreaks havoc on Americans’ health and the country’s economy. That has helped quiet a long-running debate over rising prescription costs, as policy makers prioritize finding treatments and helping businesses safely re-open.