There could be many reasons to be opposed to it, not necessarily racist ones.
You can support the rule of law - that’s not racist. You may want to support legal immigration, while closing illegal ways that commonly lead to abuse of migrants - this is straight up progressive. You may consider illegal immigrants more dangerous as they didn’t go through screening procedures - that’s up for debate, but not necessarily racist, etc. And generally, if you consider that same rules should apply to everyone, this is not racist.
However, it’s worth considering the laws of your area and the way they can affect legal migration. Going against illegal immigration and at the same time voting to complicate legal one, especially in relation to certain nationals, likely signals of racism (or, rather, ultranationalism). It is one thing to want to make the process transparent and legal and the other - to build more barriers.
There could be many reasons to be opposed to it, not necessarily racist ones.
You can support the rule of law - that’s not racist. You may want to support legal immigration, while closing illegal ways that commonly lead to abuse of migrants - this is straight up progressive. You may consider illegal immigrants more dangerous as they didn’t go through screening procedures - that’s up for debate, but not necessarily racist, etc. And generally, if you consider that same rules should apply to everyone, this is not racist.
However, it’s worth considering the laws of your area and the way they can affect legal migration. Going against illegal immigration and at the same time voting to complicate legal one, especially in relation to certain nationals, likely signals of racism (or, rather, ultranationalism). It is one thing to want to make the process transparent and legal and the other - to build more barriers.