This is an actual quote from Trump speaking in Alabama:

"They want to interfere in the elections — a commonly used tactic in third world countries. That's were this tactic comes… third world, fourth world, fifth world countries."

The term "3rd world" comes from the cold war era, where we often called the NATO aligned countries the "1st world", the Soviet countries "2nd world", and all other countries the "3rd world".

Trump thinks there is a 4th and a 5th world.

So… aliens on another planet?