“If he truly does something like this, amnesty, I think he turns many (not all) in his own party against him.”
I agree ... and I also believe doing amnesty will bring some Democrats to the table to get to 67 votes for impeachment. That is why Alaska and Louisiana are so important, narrows the gap on how many D votes we need.
turning the party against him does not matter as much to him as transforming America. If he violates his constitutional authority then the full weight of the law needs come down on him and his actions be deemed null and void.
I don’t think impeachment will happen over this, but perhaps some legislative action to nullify the EO will occur.
Of course Obama will refuse to enforce the law (what else is new?), at which point things might get interesting.