The problem isn't immigration, legal or illegal. The problem is a Govt that is supposed to be bound down by laws to protect and defend the Individual Rights of We The People for which "...Governments are instituted among Men, deriving their just powers from the consent of the governed...", and which is instead seizing hold of the power that we've given them and ignoring those laws that bind it; exercising the power that we've given them in opposition to our laws; exercising the power that we've them without even the pretense of respecting any restrictions or limitations upon their ability to exercise the power that we've given them.
When those we've given power over our lives to, promise to use power in pleasing ways if... we'll just... look the other way... and let slip our lawful restraints, they leave us with no way to restrain them with laws again, we leave ourselves with no way to prevent their using their power over us in ways that we do not find to be so very pleasing. When that's accomplished, then "As surely as Water will wet us, as surely as Fire will burn", they'll eventually use that power in ways that we'll find to be utterly horrifying.
That's the problem. And yes We The People, I'm looking directly at you.
"Where-ever law ends, tyranny begins, if the law be transgressed to another’s harm; and whosoever in authority exceeds the power given him by the law, and makes use of the force he has under his command, to compass that upon the subject, which the law allows not, ceases in that to be a magistrate; and, acting without authority, may be opposed, as any other man, who by force invades the right of another. This is acknowledged in subordinate magistrates."John Locke - OF CIVIL-GOVERNMENT BOOK II, CHAP. XVIII. Of TYRANNY
"... in questions of power then let no more be heard of confidence in man, but bind him down from mischief by the chains of the constitution."Thomas Jefferson
"...There are Church-quakes and state-quakes, in the moral and political world, as well as earthquakes, storms and tempests in the physical. Thus much however must be said in favour { 250 } of the people and of human nature, that it is a general, if not universal truth, that the aptitude of the people to mutinies, seditions, tumults and insurrections, is in direct proportion to the despotism of the government. In governments completely despotic, i.e. where the will of one man, is the only law, this disposition is most prevalent.—In Aristocracies, next—in mixed Monarchies, less than either of the former—in compleat Republick's the least of all—..."John Adams, A Defense, Boston Massacre
“If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.” Samuel Adams
“It does not take a majority to prevail ... but rather an irate, tireless minority, keen on setting brushfires of freedom in the minds of men.” Samuel Adams
“If ever the Time should come, when vain & aspiring Men shall possess the highest Seats in Government, our Country will stand in Need of its experiencd Patriots to prevent its Ruin. There may be more Danger of this, than some, even of our well disposd Citizens may imagine.” Samuel Adams