Rep. Adam Schiff (D-CA) revealed allegations on Monday that President Donald Trump’s national security adviser, Michael Flynn, may have tried to hide his unofficial discussions with Russia by using encryption technology.

Speaking to CNN’s Wolf Blitzer, Schiff explained that the Trump administration was not labeling allegations against Flynn as “fake news” because U.S. intelligence agencies may have audio recordings of him speaking to Russian officials while President Barack Obama was still in office.

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“They know that if there is a transcript, if there are recordings, that can’t be dismissed,” Schiff said. “The fact that they would mislead the country about this is inexplicable.”

“What I think is interesting here, there are allegations — again, as yet unproven — that they may have also used encrypted communications,” he added. “Since Flynn was talking with the Russians, if he was using encrypted communications, it wasn’t to conceal it from the Russians. Then you have to ask, who were they concealing conversations from?”

According to Schiff, the allegations suggest that Flynn engaged in encrypted communications in addition to the un-encrypted discussions that were reportedly recorded by U.S. intelligence agencies.

“This is something that I think we need to determine as part of an investigation,” he said. “But if there were then the question is, why were those being used? Who were those conversations to be concealed from, why was it necessary to go to that if you were simply talking about Christmas greetings as Sean Spicer apparently misrepresented to the country?”

Watch the video below from CNN, broadcast Feb. 13, 2017.