That's not true.
Republicans are for legal immigration — and against illegal immigration.
Legal immigration rose to almost two million per year under Dubya senior, dropped under Clinton, and has been around one million per year since, under Dubya, Obama, and Trump.
Reagan was the one who got legislation passed that legalized 3/4 of the illegals at the time.
The idea was that the border would be enforced (stop illegals coming across) while legalizing those in the country.
Since then, the border hasn't been enforced — Trump started, and Biden stopped those efforts — so, there won't be another Regan-like bill supported by Republicans until a strong border stops further illegals from crossing, obviously.
Meanwhile, left-wingers like AOC are actually against stopping the illegals from crossing — and illegal immigrants are happy Biden is president while they crash the border in record numbers.
Number of migrants at US border hits new record high - BBC News
Number of migrants at US border hits new record high
The number of undocumented migrants reaching the US-Mexico border has hit the highest level in more than 20 years in the latest sign of the humanitarian crisis facing the Biden administration.