I can't remember the timing, but I feel like there was a short burst where he (A) seemed to have actually chilled out and was acting a bit more Presidential, (B) signed the tax bill and (C) was getting at least some public recognition from Democratic leaders on being willing to work with them on infrastructure? This was six years ago now, so I can't really remember that well. However, I do remember thinking his first several months were pretty good?
The tax bill signing was at the lowest point of his presidency, around the time of the Alabama Senate special election. He was at 60% or higher disapprove around those months. I think summer 2018 might be when you’re thinking of.