There are several reasons why some immigrants who have lived long in the U.S. want fewer new immigrants. Here are a few key reasons.

1. Economic Competition: Recent immigrants, especially those in difficult economic situations, worry that job opportunities will decrease or wages will drop with the arrival of new immigrants. They may think that too many people competing could threaten their economic stability.

2. Cultural Integration: Those who have already immigrated have made significant efforts to adapt to a new culture. However, if a large number of new immigrants arrive suddenly, they may worry that it will become more difficult for them to integrate. They might think that if all immigrants come at once, they will all struggle to adapt well.

3. Burden on Social Systems: Some people feel that social systems like healthcare, education, and housing are already overwhelmed. They may fear that if more immigrants come, these systems will become even more strained, and they could ultimately face disadvantages themselves.

4. Nationalism and Identity: Some immigrants take pride in the culture and identity of the country they have settled in. Therefore, they may worry that a sudden increase in immigrants could undermine the existing culture or values.

5. Defense Against Negative Stereotypes: If they have experienced discrimination, they may try to distinguish themselves from other immigrants. They might think that an increase in immigrants could spread a "negative" image further. Thus, some immigrants may believe that reducing the number of immigrants is necessary for them to be better accepted or to succeed.

Juan Vargas, a progressive Democratic Congressman from some areas of California near the border with Mexico, recently conveyed the opinions of some voters who feel that immigrants are "cutting in line." Many immigrants feel that they have come "without paying the price," which is a sentiment that has existed throughout U.S. history. Especially after the pandemic, some people have come to think that others have not gone through the same difficult processes as before.

This can be explained as part of a 'law and order' mindset. Many people feel confused about the order at the border and the government's management, leading them to believe that their communities may be at risk. This thinking can explain why some Democrats support strong crime policies from Trump and the Republicans.

For example, the 'Riley Law' is a bill that aims to deport undocumented immigrants charged with certain crimes, and many Democrats support this bill. Arizona Senator Ruben Gallego claims that this law reflects the position of the Latino community well.

Even in areas where the Democratic Party is strongly supported, voters tend to favor stronger immigration policies, especially against undocumented immigrants who commit violent crimes.