Not to rain on the parade too much, but you should be careful about that poll. It's a one-time snapshot of something that has quite a lot of variability to it. Trump's approval in the poll's windowed averages is more likely the low 40s.

That said, there is no question that Trump's trend is downward. All of the polls are showing this, even Rasmussen. The only question is how fast, and if the trend will continue.