The Senate Foreign Relations Committee plans to hold an open hearing in January that will examine possible meddling by Russia in last month’s presidential election.

An aide to Sen. Bob Corker of Tennessee says he and Ben Cardin of Maryland received a classified briefing on cyber threats prior to the Nov. 8 election.

Corker is the committee’s Republican chairman and Cardin is the top Democrat on the panel.

The aide was not authorized to speak publicly and requested anonymity.

Corker said on MSNBC Tuesday that Director of National Intelligence James Clapper, the CIA and the FBI differ over whether Russia interfered to help Donald Trump win the White House. He says, “I know that’s frustrating to people.”

Clapper says his agency will release more information to the public about Russia’s attempts to influence the election once a review ordered by President Barack Obama is complete — but not before.