Joe Biden at a campaign stop on Dec. 2, 2019 in Algona, Iowa. Photo: Scott Olson/Getty Images

Former Vice President Joe Biden told a voter attending one of his campaign events on Thursday that he is "a damn liar" for making unsubstantiated allegations that Biden “sent” his son, Hunter, to work for a Ukrainian gas company in order to sell access to President Obama.

Why it matters: President Trump's request that Ukraine's president announce an investigation into the Biden's dealings in Ukraine is what sparked the impeachment inquiry. Hunter’s role with Ukrainian energy company Burisma did raise conflict-of-interest concerns at the time, but there is no evidence that the former vice president committed "corruption" of any kind in the country, as Trump has claimed.

Details: The man, who identified himself as an 83-year-old retired farmer, said that he had two concerns about Biden: his age and his son's work in Ukraine.

  • Biden responded by saying the man was "too old" to vote for him, challenging him to do push-ups or run if he wanted to "check" his shape.
  • Biden also dismissed the allegations about Hunter as nonsense.

What they're saying: Biden's senior campaign adviser Symone Sanders tweeted in response to the incident: "1) the gentleman is a self identified Warren supporter who said he would vote for the VP in a general election 2) his facts were flat-out wrong and 3) the crowd backed VP Biden up in his response."

  • Sanders denounced "debunked conspiracy theories cooked up by Trump and Rudy Guiliani about Ukraine" and said that "any assertion VP Biden said a word about the gentleman's appearance is making this something it is not."

Go deeper ... Fact check: What Joe and Hunter Biden actually did in Ukraine

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California Gov. Gavin Newsom on Monday ordered indoor operations for restaurants, wineries, movie theaters and other family entertainment like zoos, museums and card rooms to cease immediately. Bars must also close entirely.

Why it matters: It's the largest statewide rollback of a reopening plan yet, underscoring the severity of the coronavirus outbreak in California.

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Why it matters, via Axios' Bethany Allen-Ebrahimian: This is a significant, if symbolic, step toward a tougher U.S. approach to China's attempted annexation of the open seas.

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Why it matters: The two districts, which together enroll about 825,000 students, are the largest in the country thus far to announce that they will not return to in-person learning in the fall, even as the Trump administration aggressively pushes for schools to do so.