The democratic presidential nominee favors a federally-led approach, while President Trump has put states in charge of coronavirus testing

As the U.S. presidential nominees refine their messaging to the public on Covid-19 policies, former Vice President Joe Biden is pushing for widely accessible and regular coronavirus testing driven by the federal government, an approach that contrasts with much of President Trumps strategy so far.
The Trump administration has sent funds to states to spend at their discretion on testing and contact-tracing. It has helped states source supplies such as swabs and chemicals used to process tests, and more recently has placed large…