Real estate mogul and reality TV star Donald Trump took to Twitter this week to gin up fears about conspiracy theories that link vaccinations to autism.

In a series of tweets on Wednesday and Thursday, Trump launched into a vague rant about the dangers of vaccines, including one in which he declared: “Tiny children are not horses.”

His tweets are below:

No more massive injections. Tiny children are not horses—one vaccine at a time, over time. — Donald J. Trump (@realDonaldTrump) September 3, 2014

I am being proven right about massive vaccinations—the doctors lied. Save our children & their future. — Donald J. Trump (@realDonaldTrump) September 3, 2014

I’m not against vaccinations for your children, I’m against them in 1 massive dose.Spread them out over a period of time & autism will drop! — Donald J. Trump (@realDonaldTrump) September 4, 2014

So many people who have children with autism have thanked me—amazing response. They know far better than fudged up reports! — Donald J. Trump (@realDonaldTrump) September 4, 2014

h/t Mediaite