I mean, there is a big grey area between immigrants here who are:

undocumented and here temporarily (most people oppose this),

undocumented and here permanently (the left is split on this, the right is mostly against it),

documented and here temporarily (most people are fine with this, especially tourists),

documented and here temporarily with an option to become permanently (many oppose this because it's impacting employment, especially with H-1B abuse),

documented and here permanently with no intention of becoming citizens (many people on the right don't like this for assimilation reasons),

documented and here permanently an a path to citizenship (most people support this except the extreme right),

former immigrants who are now citizens (nearly everyone supports these people).

The problem is that all of this is put under a single umbrella called "immigration," but it includes so many sub-issue like rule of law and assimilation preferences that you can't have a serious debate on it.