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Photo: Aaron Lavinsky/Star Tribune via Getty Images

Congress' in-house doctor told Capitol Hill staffers at a close-door meeting this week that he expects 70-150 million people in the U.S. — roughly a third of the country — to contract the coronavirus, two sources briefed on the meeting tell Axios.

Why it matters: That estimate, which is in line with other projections from health experts, underscores the potential seriousness of this outbreak even as the White House has been downplaying its severity in an attempt to keep public panic at bay.

Dr. Brian Monahan, the attending physician of the U.S. Congress, told Senate chiefs of staff, staff directors, administrative managers and chief clerks from both parties on Tuesday that they should prepare for the worst, and offered advice on how to remain healthy.

Between the lines: Forecasting the spread of a virus is difficult, and the range of realistic possibilities is wide.

  • But other estimates, including statistical modeling from Harvard epidemiologist Marc Lipsitch, have said that somewhere between 20% and 60% of adults worldwide might catch the virus.

Yes, but: These estimates include people who will get sick and make a full recovery, and many people will catch the virus without ever feeling seriously ill.

  • Monahan told staffers that about 80% of people who contract coronavirus will ultimately be fine, one of the sources said.
  • Monahan's office declined to comment.

Meanwhile, Democratic and Republican leaders on Capitol Hill have told lawmakers they have no immediate plans to close Congress, despite it being a potential petri dish for the virus.

  • Many lawmakers fit high-risk profiles because they're over 60, have underlying health conditions and are mixing in close quarters with visitors, staff and reporters.

Go deeper: The latest coronavirus developments

Editor's note: This story has been corrected to say that Monahan told staffers he expects 70-150 million cases, not 75-150 million.

Go deeper

Australia opposes UN report warning Great Barrier Reef is "in danger"

A green sea turtle swimming among the corals at Lady Elliot island, off the coast of Queensland, Australia. Photo: Jonas Gratzer/LightRocket via Getty Images

The Great Barrier Reef should be included in a list of World Heritage Sites that are "in danger" from climate change, a United Nations committee said in a report Tuesday.

Yes, but: Australia's government said it will "strongly oppose" the recommendation by UNESCO's World Heritage Committee.

Sen. Kyrsten Sinema: Abolishing filibuster would weaken "democracy's guardrails"

Sen. Kyrsten Sinema at the U.S. Capitol building earlier this month. Photo: Samuel Corum/Getty Images

Sen. Kyrsten Sinema (D-Ariz.) defended her opposition to abolishing the 60-vote legislative filibuster in a Washington Post op-ed published Monday night, saying to do so would weaken "democracy's guardrails."

Why it matters: There have been growing calls from Democrats, particularly progressives, to overhaul the rules as the Senate prepares to vote Tuesday on a massive voting rights package. But Sinema writes in her op-ed that if this were to happen "we will lose much more than we gain."

Court blocks California assault weapons ban repeal

Photo: Patrick T. Fallon/AFP via Getty Images

A federal appeals court on Monday blocked a judge's ruling that overturned California's 30-year assault weapons ban.

Driving the news: U.S. District Judge Roger Benitez ruled earlier this month that the ban was unconstitutional and likened the AR-15 to a Swiss Army knife, but the U.S. 9th Circuit Court of Appeals has now granted a stay, pending appeal.