Susan Rice has denied a request to testify in front a Senate judiciary subcommittee next week on Russian interference in the U.S. presidential election.

According to CNN, Barack Obama’s national security adviser turned down a request from Sen. Lindsey Graham to participate in the hearing.

“Senator Whitehouse has informed us by letter that he did not agree to Chairman Graham’s invitation to Ambassador Rice, a significant departure from the bipartisan invitations extended to other witnesses,” Rice’s lawyer Kathryn Ruemmler wrote in a letter to Graham. “Under these circumstances, Ambassador Rice respectfully declines Senator Graham’s invitation to testify.” (RELATED: Does The White House Want Susan Rice To Testify? Sean Spicer Answers)

Rice was the administration official who made the dozens of requests seeking to unmask the identities of Trump associates, which she said were for national security reasons and not politically motivated. (RELATED: Susan Rice Has Given Two Different Answers In The Last 15 Days On Unmasking Trump Officials)