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J. Scott Applewhite / AP

The top Democrat in a congressional investigation of Russia's influence on the election wants more information from Facebook following the social giant's disclosure that thousands of ads focused on divisive issues were likely purchased by a Russian operator between mid-2015 and earlier this year.

"I'd like to get a more comprehensive look than perhaps what we got today," said Mark Warner, the lead Democrat on the Senate Intelligence Committee. "I think today was a good first step, but I think there's more to come."

Why it matters: Warner and others have raised questions about whether digital ad targeting systems were used to distribute "fake news" meant to tilt the results of the election and if Trump campaign could have aided Russian operatives in such an effort. Today shows the pressure isn't letting up on some of the biggest companies in Silicon Valley to account for their role in last year's tumultuous campaign.

Take note: "My hope is that we would even at some point get Facebook, Twitter and some of the other social media firms in for a public hearing," he said, adding that Twitter would be briefing committee staff in the future.

Bigger picture: Warner also said the there should be greater transparency about who is buying political ads online. The companies, he said, have "got to follow the law, and if the law needs to be changed to meet ... 21st century standards, let's have at it."

Go deeper

Updated 14 hours ago - Technology

From Malcolm X to "Free Britney," new media shapes the justice system

Illustration: Shoshana Gordon/Axios

True crime documentaries, podcasts and social media campaigns are bringing new attention to real-world legal proceedings — and are often affecting the outcome.

Why it matters: New media platforms can instantly put a national spotlight on cases that have long been forgotten or buried under red tape.

Updated 17 hours ago - Health

The next big bottleneck in the global vaccination effort

Illustration: Rae Cook/Axios

The world still needs more coronavirus vaccines, but an additional bottleneck has emerged in many low-income countries: They need help getting shots in arms.

Why it matters: Increasing vaccination rates across the world is both a humanitarian necessity and the best way to prevent dangerous new variants from emerging, but it increasingly requires complex problem-solving.

Updated 17 hours ago - Health

COVID-19 Omicron variant cases identified in Europe, U.K.

People wearing masks walk in London on Nov. 25. Photo: Li Ying/Xinhua via Getty Images

Health officials in the United Kingdom, Italy and Germany announced on Saturday that they've detected the first known cases of the new COVID-19 Omicron variant.

Why it matters: The discoveries come as the world scrambles to respond to concerns over the new variant, discovered in South Africa earlier this week.