Vice President Pence’s aides are anxious that Pence will be summoned for an interview with special counsel Robert Mueller, CNN reported Tuesday.

Those close to Pence’s office told CNN that since former national security adviser Michael Flynn pleaded guilty to lying to the FBI and Pence, it will open the door for Mueller to question Pence.

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Pence knew that Flynn had contacted Russia but didn’t know the two had discussed Russian sanctions, transition officials told the network. Pence was leading the Trump transition when Flynn called then-Russian ambassador Sergey Kislyak to discuss sanctions implemented against Russia by the U.S.

A person close to Pence told CNN that his aides are “preparing” to be called for an interview with Mueller.

"Chairing the transition would make it possible regardless of who it was,” the person said.

Pence’s office denied that they are preparing for a possible interview with Mueller.

"Nothing could be further from the truth. The vice president is focused on passing the largest tax cut in American history," Pence spokeswoman Alyssa Farah told CNN.

Court documents revealed that several other top Trump transition officials knew of Flynn’s conversation with Kislyak, according to CNN. And White House counsel Don McGahn reportedly told Trump that he believed Flynn had lied to Pence and the FBI in January, 18 days before Flynn was fired.

Flynn pleaded guilty last week to lying to the FBI about his contacts with Russian officials. He is cooperating with Mueller’s probe into ties between the Trump campaign and Russia.