Photo: Scott Olson/Getty Images

Former Rep. Beto O'Rourke endorsed former Vice President Joe Biden on stage at a rally in Dallas, Texas, Monday.

Driving the news: O'Rourke is the third former 2020 competitor to endorse Biden Monday. Former South Bend Mayor Pete Buttigieg, who dropped out of the race Sunday, also endorsed Biden at the rally. Sen. Amy Klobuchar, who ended her campaign earlier Monday, did the same.

We need someone who can bring us together and heal us. We need Joe Biden."
— Beto O'Rourke at Biden's Texas rally
  • The endorsements come just hours before polls open on Super Tuesday. Sen. Bernie Sanders holds a narrow lead in delegates over Biden, but moderates coalescing around Biden could give him a vital boost.

What he's saying: At the rally, Biden praised the gun control advocacy of O'Rourke — who campaigned for buybacks of assault weapons and who declared last year, "Hell, yes, we're going to take your AR-15, your AK-47.

  • "You're gonna take care of the gun problem with me, you're gonna be the one who leads this effort," Biden told O'Rourke. "I'm counting on you, we need you badly."

The big picture: O'Rourke dropped out of the 2020 race in November after multiple attempts to rebrand himself in the Democratic field. He'd once been the buzz of the Democratic Party after making a splash in the 2018 midterms while running against incumbent GOP Sen. Ted Cruz.

Go deeper: Joe Biden's sudden, shocking surge

Editor's note: This article has been updated with new details from the rally.

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2020 could decide fate of Keystone and Dakota Access pipelines

Illustration: Sarah Grillo/Axios

Two new court actions — one by the Supreme Court and another by a federal judge — together highlight and raise the energy stakes of November's election.

Why it matters: The legal actions mean the results of the 2020 election could very well decide the fate of Keystone XL and Dakota Access, two projects at the heart of battles over fossil fuel infrastructure.

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Illustration: Eniola Odetunde/Axios

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Pompeo: Trump administration is "looking at" TikTok ban

Secretary of State Mike Pompeo told Fox News' Laura Ingraham on Monday that the Trump administration is "looking at" a ban on Chinese social media app TikTok.

Why it matters: Lawmakers have long expressed fears that the Chinese government could use TikTok to harvest reams of data from Americans — and actions against the app have recently accelerated worldwide, highlighted by India's ban.