During a tense exchange that came late on the second day of confirmation hearings, Sen. Kamala Harris, a 2020 Democratic presidential prospect, pressed Supreme Court nominee Brett Kavanaugh about whether he had discussed special counsel Robert Mueller's investigation with anyone.

After answering he had, "with other judges I know," Kavanaugh was asked if he had discussed the probe with anyone who works at Kasowitz Benson Torres, the New York law firm founded by President Donald Trump's personal attorney Marc Kasowitz.

Kavanaugh replied that he's unsure he knows everyone who works at that law firm and asked the senator if there was a specific person she was talking about.

Later, Kavanaugh said he would like to know the specific person Harris was thinking of.

Harris fired back, "I think you are thinking of someone, and you don't want to tell us."

A Democratic aide told CNN that "we have reason to believe that a conversation happened and are continuing to pursue it."

No further details were provided by Harris to Kavanaugh during the hearing, and she said she would have questions for the record for Kavanaugh about the issue.

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