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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

55 seconds ago - Health

The drugs pushing prescription prices down for Medicare patients

Illustration: Annelise Capossela/Axios

Although net prices of brand-name drugs have increased significantly over the last decade, the savings produced by generics have actually driven average prescription prices down in Medicare's pharmacy benefit and Medicaid, according to a new analysis by the Congressional Budget Office.

Why it matters: The analysis reiterates that the generic market is largely working as intended.

2 hours ago - Sports

Robot umpires inch closer to calling MLB games

The Automated Ball-Strike system (ABS), the tech powering what's colloquially known as robo-umps, is inching ever closer to the big leagues.

Driving the news: The independent Atlantic League — which has partnered with MLB since 2019 — last week announced it was doing away with robo-umps after testing them for the past season-and-a-half.

FBI conducts "court-authorized" search of Rep. Henry Cuellar's home

Rep. Henry Cuellar. Photo: Kevin Dietsch/Getty Images

The FBI said it conducted a "court-authorized" search on Wednesday in the area of the Texas home of Rep. Henry Cuellar (D-Texas).

State of play: "The FBI was present in the vicinity of Windridge Drive and Estate Drive in Laredo conducting court-authorized law enforcement activity," an FBI spokesperson told Axios, adding that they "cannot provide further comment on an ongoing investigation."