The son of retired Lt. Gen. Michael Flynn, President-elect Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's pick for national security adviser, on Sunday appeared to spread a conspiracy theory that Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE and her campaign chief ran a child-sex ring in a back room of a D.C. pizza shop.

Michael Flynn Jr. on Sunday tweeted about the false story after an armed man entered Comet Ping Pong in Northwest D.C. and claimed to be investigating the story.

“Until #Pizzagate proven to be false, it'll remain a story," Flynn Jr. tweeted on Sunday.

"The left seems to forget #PodestaEmails and the many ‘coincidences’ tied to it,” he added, referring to Clinton campaign chairman John Podesta. Internal campaign emails allegedly from Podesta's account were published in batches by WikiLeaks in the weeks leading up to Election Day.

Until #Pizzagate proven to be false, it'll remain a story. The left seems to forget #PodestaEmails and the many "coincidences" tied to it. https://t.co/8HA9y30Yfp — Michael G Flynn(@mflynnJR) December 5, 2016

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The tweet linked to a post from the account of Jack Posobiec, who says he is the special projects director of a group called Citizens4Trump.

He described the incident on Twitter as a "false flag."

“Planted Comet Pizza Gunman will be used to push for censorship of independent news sources that are not corporate owned,” Posobiec tweeted.