Not entirely correct. There are federal laws regarding illegal entry, but not visa overstays, which are a civil infraction and constitute two thirds of the current flow.
Reading comprehension issues again? Reread my post you quoted.
That's a lame retort. There are federal laws on the books that covers people who illegally enter the country. And the federal code cites penalties for the infractions of the laws.
Start with U.S. Code › Title 8 › Chapter 12 › Subchapter II › Part VIII › § 1325
(a) Improper time or place; avoidance of examination or inspection; misrepresentation and concealment of facts
Any alien who (1) enters or attempts to enter the United States at any time or place other than as designated by immigration officers, or (2) eludes examination or inspection by immigration officers, or (3) attempts to enter or obtains entry to the United States by a willfully false or misleading representation or the willful concealment of a material fact, shall, for the first commission of any such offense, be fined under title 18 or imprisoned not more than 6 months, or both, and, for a subsequent commission of any such offense, be fined under title 18, or imprisoned not more than 2 years, or both.
Then you can go to U.S. Code › Title 8 › Chapter 12 › Subchapter II › Part IV › § 1227
Then U.S. Code › Title 8 › Chapter 12 › Subchapter II › Part V › § 1253