Somebody Call the Manager. Fact-Checkers Report 169 Climate Videos and Complain YouTube Didn’t Take Their Call

First of all, an illegal alien broke the law entering the country.

Second, those illegal aliens are not undocumented migrants. That is applied to refugees who did not have time and opportunity to process in through the system BUT were supposed to process through on arrival.

The Constitution, specifically The Bill of Rights does not specific that those Amendments only apply to citizens. So there is a Constitutional argument in favor of applying those specific rights to anyone here.

Illegal immigration is not a binary issue as so many declare.
It is complex with many nuances that do not apply universally.

Due process is commonly understood as a court case. It is not universally the definition. It is due process under the law and if the law allows action without a court, it is still due process.

The privilege to vote in all levels of government is not dictated by the original Constitution and the Constitution provided that authority to the States.

That aside, I am expressly against non-citizen voting in Federal Elections.
What States, counties, towns, etc. decide to do is their business. States are, still, on paper, sovereign.