There was an article that talks about how Republicans tend to gain from immigrants. It talks about low-skilled immigrants driving native voters to Republicans: "Non-urban, low-skill counties with high local public spending strongly increased their Republican vote share in response to low-skilled immigration." It is also worth noting that many of the heavily immigrant neighborhoods that shifted towards Trump in the 2020 presidential race have lower than average education levels. This was a shift that occurred within immigrant communities themselves.
However, I noticed Trump and other Republican figures that are critical of immigration are trying to push an idea called "merit based" immigration. Why would this be an issue? Republicans have been talking about how from their view immigrants and Democrats have an alliance, and most immigrants who show up to vote support Democrats at the ballot box. (This is true, but they are also more likely to identify as independent or nonpartisan. In addition this is why I am asking this question.)
What is the motivation for talking about merit-based immigration if it removes or reduces types of immigrants that drive native-born towards Republicans as well as ones Republicans gained more with particularly in the 2020 presidential race?