That's a pretty ridiculous strawmen argument.

>Anti-tax activist Grover Norquist famously declared, "I don't want to abolish government. I simply want to reduce it to the size where I can drag it into the bathroom and drown it in the bathtub."

And his name is often invoked because he's such a fringe extremist. I doubt even 5% of Americans would agree with him, much less the ~40% who identify as right-leaning as you seem to imply.

It does not really matter whether those ~40% would agree. It only matter what portion of those would vote for someone who does. As a floor for that number I would submit that the Freedom Caucus has 32 of the 198 Republican seats in the house (~16% or Republican seats). Those Representatives have pretty much declared that they agree with him. So some percentage above that.

He holds a massive amount of sway within the Republican party.