Each illegal alien is cutting the power of your vote in half. Gerrymandering is happening as a result of illegal immigration and sanctuary policies.
Congressional voting districts are apportioned every 10 years using census data. Census data is based on the total residents in congressional districts. It is NOT based on the number of citizens. Also, the number of electors in the Electoral College is decided by that same apportionment method.
Democrats fight against inclusion of questions in the census about citizenship, immigration status, etc. And they resist voter ID regulations. And they resist employment ID verification like e-verify. And they resist changes to laws and executive orders and bureacracy policies that would stop federal benefits going ilegally to illegal aliens. Those same Democrats support questions about gender identity and race. But they do not want a count of illegal aliens. They are Gerrymandering the vote.
The net result is each citizen is losing their representation in Congress and in presidential elections. Illegal aliens do not need to vote. The power of your vote is reduced whether they vote or not, but further reduced if they do vote illegally.
Politicians want to be seen supporting programs for illegal aliens such as sanctuary jurisdictions in order to attract illegal aliens to their district. A sanctuary state has proportionally more representatives in the U.S. House and more electors in the Electoral College. More representatives and more electors increase the political power of a political party and its leaders and correspondingly reduces the voting power of citizens and non-sanctuary states.
Doing the trivial arithmetic, each illegal alien cuts your vote in half. And the next illegal alien cuts your vote in half again, and so forth, even if the illegal alien does not vote. (And we know that millions of illegals do vote.) In other words, sanctuary policies are unconstitutionally disrupting the balance of power between citizens and government.
During the Obama administration, SCOTUS ruled against Texas and a Texas voter who challenged this illegal dilution of a citizens vote. Hopefully, that SCOTUS ruling will be reversed by a SCOTUS which decides cases based on orginal construction and meaning of the Constitution. It should be reversed before the 2020 census.