Trump endorses vaccine conspiracy theory in leaked call with RFK Jr.

• In a leaked video, Republican presidential nominee Donald Trump repeated false conspiracy theories about childhood vaccinations on a call with third-party presidential candidate Robert F. Kennedy, Jr.
• The clip also shows Trump telling his ostensible campaign rival, "I would love you to do something."
• The call allegedly took place one day after Trump survived an assassination attempt at a campaign rally in Pennsylvania on Saturday. The video clip does not appear to show the entire call.

Republican presidential nominee Donald Trump repeated false conspiracy theories about childhood vaccinations during a recent call with the third-party presidential candidate Robert F. Kennedy Jr., according to a video of the call leaked Tuesday.

Trump can be heard saying that, after receiving vaccines to protect infants against life-threatening diseases, "You see the baby all of a sudden starting to change radically."

The clip also shows Trump telling his ostensible campaign rival, "I would love you to do something. And I think it'll be so good for you and so big for you."

When Trump adds, "We're going to win" the election, Kennedy responds, "Yeah."

It was not clear what Trump was suggesting Kennedy should do. A Trump campaign spokesman did not immediately respond to CNBC's request for clarification about the leaked conversation, which Kennedy verified later Tuesday morning.

But the clip offers more evidence for Biden supporters who have accused Kennedy of running a spoiler campaign that is likely to benefit Trump in November.

The 98-second video, which was posted online and then deleted by Kennedy's son, Bobby Kennedy III, captures Trump's voice on a cell phone being held by Kennedy, an independent presidential candidate and documented