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President Donald Trump stands with John Kelly. Photo: Aaron P. Bernstein/Getty Images

White House Chief of Staff John Kelly threatened to quit on March 28, according to sources familiar with the events.

What I'm hearing: Kelly blew up at Trump in an Oval Office meeting that day, and while walking back to his office muttered he was going to quit. Sources said it was not related to the David Shulkin firing that happened the same day.

A senior administration official said that calling it a threat was "probably too strong, it was more venting frustration." Kelly often says he doesn't have to be there and didn't seek the job originally.

Details:

  • Kelly packed up some personal belongings, though I'm told that wasn't necessarily because he was walking out. 
  • He was fired up enough that colleagues got allies to call in to calm him down. 
  • At one point DHS Secretary Kirstjen Nielsen — perhaps the person in the administration he trusts most — came over to talk him off the ledge. 

Context: Kelly has verbally threatened to quit more than once over the past eight months.

Why it matters: Very few people inside this White House feel secure or satisfied, given the wild, unpredictable mood and policy changes of Trump. Kelly months ago restored some order and sanity to the place but most of that is gone. 

Get more stories like this by signing up for our weekly political lookahead newsletter, Axios Sneak Peek. 

Go deeper

14 mins ago - Health

Moderna to file for FDA emergency use authorization for COVID-19 vaccine

Photo illustration by STR/NurPhoto via Getty Images

Moderna announced that it plans to file with the FDA Monday for an emergency use authorization for its coronavirus vaccine, which the company said has an efficacy rate of 94.1%.

Why it matters: Moderna will become the second company to file for a vaccine EUA after Pfizer did the same earlier this month, potentially paving the way for the U.S. to have two COVID-19 vaccines in distribution by the end of the year. The company said its vaccine has a 100% efficacy rate against severe COVID cases.

The social media addiction bubble

Illustration: Annelise Capossela/Axios

Right now, everyone from Senate leaders to the makers of Netflix's popular "Social Dilemma" is promoting the idea that Facebook is addictive.

Yes, but: Human beings have raised fears about the addictive nature of every new media technology since the 18th century brought us the novel, yet the species has always seemed to recover its balance once the initial infatuation wears off.

Young people's next big COVID test

Illustration: Eniola Odetunde/Axios

Young, healthy people will be at the back of the line for coronavirus vaccines, and they'll have to maintain their sense of urgency as they wait their turn — otherwise, vaccinations won't be as effective in bringing the pandemic to a close.

The big picture: "It’s great young people are anticipating the vaccine," said Jewel Mullen, associate dean for health equity at the University of Texas. But the prospect of that enthusiasm waning is "a cause for concern," she said.