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So Snopes took it on and essentially concluded that, according to the best data and metrics available to them, he's more like mid-140's. Note: this doesn't mean Snopes (which wears its political bias pretty proudly on its sleeve) is claiming Trump's IQ is 140-something. They're simply compiling opinions built on methods that range from 'serviceable' to 'downright dependable' in predicting the IQ's of college attendees by looking at SAT's, etc..
In the 150's, he's generationally-gifted. In the 140's, he's merely exceptional and--even among the well-educated--the heavy favorite to be the smartest guy in the room. 'cept here at SSI--and I mean that only ~1/4 tongue-in-cheek.