On what basis do you believe this?
The border is a mess, for one.
If they wanted to stop immigration it would be easy and they’d do it. Start arresting the employers of these people. That will stop immigration. But you don’t ever hear calls for that solution. Why not? Because too many people are making too much money from immigrants and they don’t want it to stop. Trump will raise holy hell about it, but he won’t do shit for that very reason.
There's another reason this won't be implemented. A lot of the businesses that benefit from all that cheap migrant labor also are politically well-connected and make healthy donations to the "tough on the border" types. Kinda makes it unlikely that the sheriff who's fond of "rounding up illegals" will put the owners of that meat packing plant in zip ties along with the workers.
We had "employer sanctions" written into law here in Arizona. Twice. First with a "tough on illegals" bill and then the infamous "papers please" SB1070. Know how many business owners had to suffer the consequences? One. And they weren't arrested...just given a relatively tame fine.
Now about this part:
You can't have a country if anybody who shows up at the border can just come in. Which is what you "open border" types want.
Look around, Derec. This is a big reason why we "have a country" as it is today. A whole lot of people - from dirt poor workers like my great grandparents, to folks like Andrew Carnegie who would go onto be one of the richest industrialists in America - showed up on a boat long before we had today's immigration policies. Got a strong back? We could use ya, and don't worry about the language...you just move into this Polish/Italian/Irish neighborhood and they'll get you up to speed. Millions came here in the wake of the industrial revolution, and we even put a big statue in New York harbor to welcome them. The folks who came across the Pacific weren't welcomed as nicely, but (until the Chinese Exclusion Acts) were accepted and put to work building railroads with steel made by immigrants who worked at places immigrant-owned Carnegie Steel.
"But this is different! They're brown and coming across the southern border!" Yeah, that's not new either. A lot of the food that fed those rail workers was grown and picked by migrant workers from Mexico. You notice that there's a lot of places in the southwest and California with names like "Los Angeles," "Las Cruces," and "San Antonio," right? There are multi-generational families whose ancestors walked across the border or - in some cases - lived in Aztlan before it was even part of America.
Finally, don't give me this "open borders types" shit. Have you ever even been to our southern border? I used to cross back and forth into Mexico often, lived a mile from a port of entry when I lived in New Mexico, and I can assure you the border is not "open." The border crossings are busy (hundreds of millions of dollars in trade flows through them) but are also pretty well fortified. Pro tip: Do NOT mess with the border patrol...on either side. You WILL regret it. There's a lot of desert between the ports of entry, but that's patrolled by thousands of agents backed up by technology and for those of you who chanted "build the wall," while drooling over Trump, the simple truth is that building a wall is overpriced and ineffective. I lived in El Paso long enough to watch the barrier along the Rio Grande between downtown and Sunland Park go from a chain link fence with razor wire on top, to what looks the fencing around a maximum security prison complete with guard towers and spotlights. It looked impressive enough, but didn't do shit to stop people determined to get across. "But what about the Fentanyl?!" Yeah, somewhere around 90% of that is brought across the border at ports of entry by American citizens. Finally, you wanna know which administration built more barriers, spent more money on the border, and hired more agents by several orders of magnitude than the "tough on the border" Republicans? Obama/Biden.