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Jeff Chiu / AP

Facebook will give congressional investigators access to the more than 3,000 ads bought by Russian operatives during the campaign, it said on Thursday, reversing a previous decision that had drawn criticism. It also said it would increase transparency around political ad spending in a move that gets ahead of any new disclosure rules lawmakers could try to impose on digital campaign ad spending.

Details: Facebook had previously said it hadn't provided that information to congressional investigators, citing privacy concerns and federal law, but had provided the information to Special Counsel Robert Mueller. Colin Stretch, the company's general counsel, said Thursday that the decision had been made after a legal review.

"We believe it is vitally important that government authorities have the information they need to deliver to the public a full assessment of what happened in the 2016 election," said Stretch in a blog post. "That is an assessment that can be made only by investigators with access to classified intelligence and information from all relevant companies and industries — and we want to do our part."

New rules for political ads: In what is perhaps the most drastic change for advertisers and ad buyers, Zuckerberg said that in the coming months they will not only require that advertisers have to disclose which page paid for an ad, "but we will also make it so you can visit an advertiser's page and see the ads they're currently running to any audience on Facebook."

In a separate post, Facebook issued a set of answers to questions around the probe. Key takeaways:

Facebook says it didn't know when the ads were purchased that they might be part of a Russian operation because they were uploaded using Facebook's self-service tool, and weren't sold directly from a Facebook salesperson to a client.The company says it's possible there are more ads from Russian or other foreign actors using fake accounts, but it is actively looking for this type of abuse. "It's possible that government investigators have information that could help us," said Elliot Schrage, the company's top policy executive, in the post.

What they're not doing: Releasing this information to the public.That's not likely to satisfy critics who argue there should be more transparency required about who buys digital political ads. Facebook cited "sensitive national security and privacy issues" involved in the investigation.

Key quote: "I don't want anyone to use our tools to undermine democracy," said Facebook CEO Mark Zuckerberg on Thursday. "Now, I wish I could tell you that we're going to be able to stop all interference. But that just wouldn't be realistic."

Go deeper

Climate reckoning for oil and gas CEOs

Illustration: Aïda Amer/Axios

Top executives from ExxonMobil, BP, Chevron and Shell will face a reckoning on Capitol Hill Thursday, as they're grilled on evidence that their companies knew for years that their products were driving climate change but chose to downplay or deny it.

Why it matters: The hearing before the House Oversight Committee will be the first time these executives have been brought together to provide sworn testimony regarding what they knew about the ties between their company's products and climate change, and when they knew it.

Updated 3 hours ago - Science

Nor'easter slams East Coast with flooding rain and powerful winds

A residential area in Middlesex County as floodwater from the nor'easter covers streets in New Jersey on Tuesday. Photo: Tayfun Coskun/Anadolu Agency via Getty Images

A monster storm was slamming the Northeast with record rainfall and powerful winds over Tuesday night — causing flash flooding that resulted in people having to be rescued in New Jersey and New York roads to close.

Threat level: All of southern New England westward to New York City and northern New Jersey was under the threat of flash flooding and coastal flooding from the nor'easter through Tuesday night into early Wednesday, per the National Weather Service.

3 hours ago - World

Blinken speaks with Sudan prime minister after his release

Sudan's Prime Minister Abdallah Hamdok. Photo: Ebrahim Hamid/AFP via Getty Images

Secretary of State Tony Blinken spoke on the phone on Tuesday evening with Sudan’s Prime Minister Abdalla Hamdok after the military released him from custody.

Why it matters: Hamdok’s release was a result of pressure on Sudan’s military leader General Abdul Fattah al-Burhan from the U.S. and other countries but also from the different political parties in Sudan and massive protests in the streets.