Here are a few of the salient facts and features of being invaded by migrants.
First, you have to pay for them to get to and then enter your country illegally> This is what government/taxpayer funding of NGOs means.
Second, you have to pay for the direct costs of transporting, feed and housing them.
Third, you have to pay for the indirect costs of higher insurance premiums, emergency services expenses, and high rent costs particularly for those on the lower socioeconomic rungs.