Michael Flynn Jr. has been let go from President-elect Donald Trump's transition team&nbsp;after spreading online conspiracy theories on Twitter. He is the son of Trump's pick for national security advisor, Gen. Michael Flynn."The younger Michael Flynn was helping his father with some administration and scheduling duties early on in the&nbsp;transition&nbsp;process, and he is no longer involved with&nbsp;transition&nbsp;efforts," spokesman Jason&nbsp;Miller said in a teleconference Tuesday.After an armed gunman fired a rifle&nbsp;in&nbsp;Washington's Comet Ping Pong&nbsp;restaurant on Sunday in anger over a false child sex trafficking rumor, Flynn Jr. continued to promote the so-called PizzaGate&nbsp;conspiracy theory&nbsp;that inspired the shooting. The pizzeria has fended off threats since the story erupted about&nbsp;a&nbsp;month ago.As Flynn Jr.'s tweets attracted national attention Monday, news broke that he had a government email, suggesting&nbsp;he was part of the Trump transition team &ndash; though Vice President-elect Mike Pence denied it on MSNBC's "Morning Joe" Tuesday.The elder Flynn has also spread&nbsp;false stories. A&nbsp;week&nbsp;before the election he promoted a rumor on social media that Hillary Clinton was involved with sex crimes involving children.