When the deal was first announced, German representatives mentioned that due to USA government actions, they anticipated a continued long-term decline in flights to the USA. That was a factor in choosing a Canadian location ... as well as AME (aircraft maintenance engineering) training at the local Polytechnic.
Now that 18 and 19 year old female German tourists are being strip-searched prior to being turned away at the border, I think many Europeans will reconsider travel to the USA. Since it's evident that the girls were going to be turned away from the moment they got off the plane, the strip search is very questionable. They did nothing wrong, they were not carrying anything illegal, the strip search did not change anything ... so the strip search must have been for kicks and giggles.
I have a different take on the German teenagers refused entry to the US In Hawaii.
They were young ( 18 and 19) and inexperienced, having been on a gap year trip that so far only included Thailand and New Zealand. One had a B2 visa, the other was on the US Visa Waiver Program under the ESTA entry. Both of those allow potential US visitors to present themselves at US immigration for admission, but do not guarantee admission.
The requirements for admission to the US would have required proof of a documented exit ticket from the US within the time limits of their respective visits, proof of accommodation and tourism plans, and proof of funds to support themselves while in the US without working.
They had also been in an area of high-risk drug trafficking, especially Thailand, so they were potential targets for drug trafficking. That is why they would have had a strip-search and imaging studies.
Clearly, their plans for the US visit were very vague and they would not have had enough funds to support themselves without working, even as babysitters, cleaners, etc for cash, meals, lodging, or other barter payment. It used to be that many young europeans would travel doing seasonal work, especially in Australia or New Zealand. That is not the case in the US. People entering the US under a tourism status are specifcially prohibited from working. They also likely did not have purchased tickets for exit from the US, nor confirmed accommodations for either the Hawaii or California parts of their stays.
Trying to enter on a Visitor status and intending to work for wage or barter is considered Visa Fraud and will get you refused entry and returned on the next plane back to where your entry flight came from, with some very strong notes in your files about Visa Fraud that will make you inelligible to return to the US for at least 5 years, and possibly unable to enter other countries who would share the same rules about illegal work ( Costa Rica and Mexico being in that category).
Being young and stupid is no longer an excuse to violate the rules on visitor entry to the US. The laws they violated have been around for decades and are not unique to this current administration.