The White House didn’t deny reports Monday linking the U.S. to a cyberattack that cut off internet access to WikiLeaks founder Julian Assange, following the activist group’s publication of embarrassing emails that have undermined Hillary Clinton’s presidential campaign.

White House press secretary Josh Earnest said he isn’t authorized to discuss any possible “classified” operations by the U.S.

“I’m not in a position to confirm whether that’s true or not,” Mr. Earnest said of reports that the U.S. is responsible.

WikiLeaks said Mr. Assange’s Internet access has been cut by an unidentified state actor. He has been up holed up at the Ecuadorean Embassy in London for more than four years, hoping to avoid extradition over for alleged sex crimes.

WikiLeaks has been releasing thousands of emails of Clinton campaign chairman John Podesta, including texts of her speeches to Wall Street banks and other revelations that have portrayed her and her campaign officials in unflattering positions.

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