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Photo: Jim Watson/AFP via Getty Images

Julián Castro, who dropped out of the 2020 presidential race last week, endorsed Elizabeth Warren on Monday.

"There's one candidate I see who's unafraid to fight like hell to make sure America's promise will be there for everyone, will make sure that no matter where you live in America or where your family came from in the world — you have a path to opportunity, too."

Why it matters: It's one of the first high-profile endorsements from a former presidential contender this cycle — and it's significant because Castro is widely viewed as a leading vice presidential pick for the eventual nominee.

Our thought bubble, via Axios' Alexi McCammond: Castro and Warren have been pretty close throughout the primary, and his endorsement reflects that bond they’ve shared.

  • They will be campaigning together, and he will make solo appearances without her as well.
  • If Warren has to be pulled from campaign trail to participate in the Senate impeachment trial, Castro will be a crucial surrogate during that time.

Watch the video:

A tweet previously embedded here has been deleted or was tweeted from an account that has been suspended or deleted.

Go deeper: Elizabeth Warren on the issues, in under 500 words

Go deeper

3 hours ago - Health

WHO: Not yet known whether Omicron leads to more severe disease

Photo illustration: Pavlo Gonchar/SOPA Images/LightRocket via Getty Images

The World Health Organization on Sunday said that it is not yet clear whether the newly discovered Omicron variant is more transmissible than other strains of the COVID-19 virus.

Why it matters: The agency's statement comes as the variant, discovered in South Africa, has already been detected in European and Asian countries.

8 hours ago - Health

Fauci: Omicron variant will "inevitably" be found in U.S.

Photo: Chip Somodevilla/Getty Images

Anthony Fauci, the director of the National Institute of Allergy and Infectious Diseases, cautioned on Sunday that the COVID-19 Omicron variant will "inevitably" be found in the United States.

Driving the news: Fauci, Biden's chief medical adviser, told ABC's George Stephanopoulos on "This Week" that U.S. officials will meet with colleagues from South Africa later on Sunday to try to determine the severity of the cases, as countries scramble to learn more about the variant.

Updated 10 hours ago - Politics & Policy

Dems fear supply-chain blame

Illustration: Aïda Amer/Axios

As supply-chain kinks drive up prices and disrupt holiday shopping, Democrats are scrambling to show action and deflect blame.

Why it matters: With their party controlling both the White House and Capitol, vulnerable Democrats worry supply-chain snafus will hurt them in next year's midterms.