President Donald Trump on Tuesday warned Americans to brace for a "hell of a bad two weeks" ahead as the White House projected there could be 100,000 to 240,000 deaths in the U.S. from the coronavirus pandemic even if current social distancing guidelines are maintained.

For many in the public health and political worlds, Dr. Deborah Birx is the sober scientist advising an unpredictable president. She's the data whisperer who will help steer President Donald Trump as he ponders how quickly to restart an economy that's ground to a halt in the coronavirus pandemic.