Republicans have always supported legal immigration.
Thays either a lie, or you are incredibly misinformed.
https://thehill.com/homenews/senate/438221-gop-senators-introduce-bill-to-reduce-legal-immigration/
https://www.cnbc.com/2018/11/08/trump-unveils-hard-line-immigration-policy-that-limits-asylum.html
https://www.cnn.com/2018/06/26/politics/republicans-oppose-legal-illegal-immigration/index.html
The writing is on the wall, and very clear to see for anyone who isn’t in the Trump cult. Republicans want to end all forms of immigration.
And you don’t need to go far even within this sub to find out your wrong: