(CNN) Ex-Donald Trump campaign aide George Papadopoulos was released from prison Friday morning after serving 12 days for lying to investigators about his contact with individuals tied to Russia during the 2016 campaign.

Papadopoulos exited a federal prison in Oxford, Wisconsin, shortly after 10 a.m. ET.

In his first tweet after being released, Papadopoulos thanked "patriots" for their support of his cause and announced the pending release and available pre-order of his new book, "Deep State Target."

"Glad to have been released today, I am extremely grateful to patriots who supported me, and I'm thrilled to announce the upcoming publication of my book DEEP STATE TARGET," he tweeted

As part of his sentence, Papadopoulos will now have 12 months of supervised release, must serve 200 hours of community service within about one year, and must pay a $9,500 fine.

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