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At a Rose Garden news conference, President Trump declared that the United States has “met the moment and ... prevailed” in terms of testing for the novel coronavirus. Later, Trump walked out after a tense exchange with two reporters.

Meanwhile, most White House officials will be asked to wear masks or face coverings in public spaces on complex grounds, administration officials said. Yet Trump is still unlikely to wear a mask or face covering, aides say.

Here are some significant developments:

  • Democratic senators are preparing to grill top federal health officials Tuesday at a highly anticipated hearing on the pandemic, with much of the questioning centered on whether the nation is ready to reopen.
  • Joe Biden’s presidential campaign unveiled a new digital ad slamming Trump’s response to the pandemic, arguing that the president’s actions plunged the country into an unprecedented crisis.
  • Louisiana became the latest state to announce plans for a “phase one” reopening, although the mayor of New Orleans said she would announce her own plan Tuesday. Check on any state’s reopening plans with this interactive map.
  • Tesla chief executive Elon Musk said he would defy local orders and reopen a factory, daring officials to arrest him. He also threatened to move business from California to Texas or Nevada.
  • Anthony S. Fauci, Trump administration’s top infectious-diseases expert, thinks it is at least “feasible” that NFL fans could see professional football get underway as planned this fall.
  • China is struggling to put an end to transmission, with new cases reported in the cities of Wuhan and Shulan.