Trump is setting records at Rasmussen Reports for record high disapproval at 57%, record low total approval at 41%, record high strong disapproval at 47%, and record low approval index at -20

I dunno, was it something he said lol?

To be entirely fair, these low numbers were already achieved on Feb 5, the day Trump posted the Obama ape video. The low numbers went up in the morning and reflect polling from the previous day(s).

The Obama ape video was just a coincidence. 

I think the low numbers are a reaction to Trump's Monday call for federal interference in the coming elections.