It appears to me that you might have missed a step here.https://fivethirtyeight.com/features...home-to-trump/Gallup’s most recent weekly survey, conducted from Feb. 5 to 11, showed President Trump’s job approval rating among self-identified Republicans at 86 percent. It was the third straight week that his rating was above 85 percent — an improvement compared with 2017. Trump’s support among Republicans spent much of last year in the low 80s, even dipping into the 70s at times.
From this I conclude the average self-identified Republican is a Trump supporter, per this, and Breitbart agrees. (Not cited)
If you're talking about non-Republican conservatives, then you might be right, who knows? According to Gallup, 26% of population self-identifies as Republican, so by extension 85% of Republicans 26% is 22% of Republicans in the population approve of President Trump. I understand President Trump's approval hovers around 40% of the population so about 18% of the rest of the population also approve. Presidential elections are 50/50, Republican/Democrat, or near enough, so I'm having trouble determining where you find a block of non-Trump conservatives of significant enough size to matter - it looks like 10% of the population, max, to me.