Here’s what you need to know: Models predicting expected spread of the virus in the U.S. paint a grim picture. President Trump strikes a somber note as he warns of a “painful two weeks ahead.” The Trump administration had invoked the Defense Production Act hundreds of thousands of times, but hesitated when the virus hit. Trump says he “hasn’t heard about testing for weeks,” but governors say they still lack test kits. Stocks dipped as Wall Street finished its worst month since 2008. The C.D.C. is reviewing its guidance on wearing masks. Asian countries see that success containing the virus can be tenuous, a worrisome sign.