Facebook CEO Mark Zuckerberg confirmed that special counsel Robert Mueller's team has interviewed the Facebook staff about Russian meddling in the 2016 election.

Zuckerberg said his employees have spoken to the Mueller team, but he has not personally been interviewed.

"I want to clarify, I'm not sure we have subpoenas. I know we're working with them," Zuckerberg said.

CNN reported in September that Facebook handed Russia-linked ads over to Mueller under a search warrant.