The "Bus tour" is a nod to a time when Americans wouldn't put up with contraband labor and illegal immigration - an era long forgotten where bus, train, and ships "toured" half of the US illegals back deep into Mexico.
The Christian Science Monitor provided a history lesson of the wise action sometime ago, Operation Wetback:
https://www.csmonitor.com/2006/0706/p09s01-coop.html
1. When Dwight Eisenhower became president the southern border was as porous as a colander sieve. Up to three million illegal aliens walked and waded north, and Eisenhower promised to end the unethical officialdom's corrupt "special treatment" of overlooking the illegal mass migration on behalf of "farmer-exploiters" of illegal labor... having climbed to a 1,000,000 cases per year.
2. At the time, there was an estimated illegal labor force of up to 3 million (in addition to the bracero program legal labor). Low-cost, docile, non- unionized workers, the farmers and ranchers became dependent on the cheap labor, paying approximately half of the farm wages they paid to legals elsewhere (per a study of the President's commission).
3. Senior US officials were friends with many ranchers, and agents "did not dare" arrest their illegal workers under threat of political intervention.
4. But for nearly ten years, the good old boy system was changed. In 1954, Ike appointed retired Gen. Joseph "Jumpin' Joe" Swing, a former West Point classmate and veteran of the 101st Airborne, as the new INS commissioner. One of Swing's first decisive acts was to transfer certain entrenched immigration officials out of the border area to other regions of the country where their political connections would have no effect.
5. On June 17, 1954, "Operation Wetback" began. In California and Arizona, the roundup of aliens began. Some 750 agents swept northward through agricultural areas with a caravan of busses, with a goal of 1,000 apprehensions a day.
By the end of July, over 50,000 aliens were caught in the two states. Another 488,000, fearing arrest, had fled the country.By mid-July, the crackdown extended northward into Utah, Nevada, and Idaho, and eastward to Texas.
By September, 80,000 had been taken into custody in Texas, and an estimated 500,000 to 700,000 illegals had left the Lone Star State voluntarily.
6. The Mexicans caught in the roundup were shipped in buses and trains deep within Mexico before being set free. Tens of thousands more were put aboard two hired ships, the Emancipation and the Mercurio. The ships ferried the aliens from Port Isabel, Texas, to Vera Cruz, Mexico, more than 500 miles south to Vera Cruz. The total deported and coerced into leaving is estimated to be as much as 1.5 million.
7.
General Swing's fast-moving campaign soon secured America's borders – an accomplishment no other president has since equaled. Illegal migration dropped 95 percent to the late 1950s. And they did it with a mere 750 border agents.
In the mid-20th century it was a no brainer and a model for today: move state to state and round em up, ship em out. Load the herds in boarded up old train cars with guards, buses with jail barred windows, and old ships under destroyer escort. And should any try to escape, then use (potentially lethal) force.
