A day after Facebook disclosed that ads purchased by Russia before and after the 2016 election may have reached as many as 10 million people in the United States, a clearer picture of the Kremlin’s micro-targeting operation has emerged. Sources tell CNN that Russia took aim at two swing states that ultimately proved critical for Trump’s victory in the 2016 election: Michigan and Wisconsin, states where Trump beat Hillary Clinton by just over 33,000 votes in total. The ads, which CNN reports were “highly sophisticated” in their targeting of key demographic groups, are the first indication of what parts of the country Russian operatives may have tried to sway during the election and raises new questions about whether they had any help.

This new evidence could be critical as Justice Department special counsel Robert Mueller and congressional investigators continue their probe into Russian interference in the election. It could bring new scrutiny to the election data operation run by Jared Kushner, which used Cambridge Analytica, the data-mining firm funded by Trump backer Robert Mercer, to place ads on Facebook. Both the firm and Kushner have denied any collusion with foreign agents, but some members of Congress have openly wondered whether Russians somehow accessed their data. “I think the Russians had help,” said Congresswoman Jackie Speier, a California Democrat and a member of the House Intelligence Committee. “I’ve always wondered if Cambridge Analytica was part of that.”

In interviews, Kushner has been eager to take credit for the Trump campaign’s data operations. “I called somebody who works for one of the technology companies that I work with, and I had them give me a tutorial on how to use Facebook micro-targeting,” he told Steven Bertoni of Forbes last year. “We brought in Cambridge Analytica. . . . We basically had to build a $400 million operation with 1,500 people operating in 50 states, in five months. We started really from scratch.”

That operation may now be of interest to investigators as they seek to piece together how Russia developed such a targeted micro-targeting operation of its own. “Obviously, we’re looking at any of the targeting of the ads, as well as any targeting of efforts to push out the fake or false news or negative accounts against Hillary Clinton, to see whether they demonstrate a sophistication that would be incompatible with not having access to data analytics from the campaign,” Rep. Adam Schiff, the committee’s top Democrat, told CNN Tuesday. “At this point, we still don’t know.” Brad Parscale, who ran Trump’s digital-campaign efforts, has agreed to testify before the committee.