Flynn posted the tweet on Nov. 2, linking to a piece on the fake news website True Pundit that claimed an FBI investigation into former Rep. Anthony Weiner's (D-NY) computer had turned up evidence "to put Hillary (Clinton) and her crew away for life."
"U decide - NYPD Blows Whistle on New Hillary Emails: Money Laundering, Sex Crimes w Children, etc...MUST READ!" read Flynn's tweet, which can still be viewed in the Internet Archive.
It's unclear why Flynn chose to delete this tweet now, and no other tweets appear to have been deleted, according to CNN.
Flynn and his son have come under fire for tweeting links to fake news stories, especially since a man opened fire in a Washington D.C. pizza shop earlier this month in the course of "investigating" an online conspiracy theory about Democratic operatives running a child sex ring there.
Flynn's son's posts about that conspiracy theory, known as "Pizzagate," reportedly got him fired from Trump's transition team.
Retired Army Gen. Barry McCaffrey has said he changed his opinion on the incoming national security adviser after reading his tweets.