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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

CPAC Republicans choose conservatism over constituents

Rep. Matt Gaetz. Photo: Elijah Nouvelage/Bloomberg via Getty Images

CPAC proved such a draw, conservative Republicans chose the conference over their constituents.

Why it matters: More than a dozen House Republicans voted by proxy on the $1.9 trillion COVID-19 relief bill in Washington so they could speak at the Conservative Political Action Conference, known as CPAC. And Sen. Ted Cruz skipped an Air Force One flight as President Biden flew to Cruz's hometown of Houston to survey storm damage.

Border Democrat warns Biden about immigrant fallout

Henry Cuellar (right). Photo: Tom Williams/CQ-Roll Call Inc. via Getty Images

A Democratic lawmaker representing a border district warned the Biden administration against easing up too much on unauthorized immigrants, citing their impact on his constituents, local hospitals and their potential to spread the coronavirus.

Why it matters: Rep. Henry Cuellar (D-Texas) told Axios he supports President Biden. But the moderate said he sees the downsides of efforts to placate pro-immigrant groups, an effort that threatens to blow up on the administration.

In CPAC speech, Trump says he won't start a 3rd party

Trump at CPAC on Feb. 28 in Orlando, Florida. Photo: Courtesy of C-SPAN.

In his first public speech since leaving office, former President Trump told the audience at the Conservative Political Action Conference (CPAC) that he would not start a third party because "we have the Republican party."

Why it matters: The former president aims to cement himself as Republicans' "presumptive 2024 nominee" as his top contenders — including former members of his administration — face the challenge of running against the GOP's most popular politician.