Trump is wrong on this. A single payer system will never work no matter how it is modified by Countries like Canada and Scotland. The element of competition is destroyed and that is the only real conservative factor that would keep cost down. The main reason why the former American private health care companies were failing is the Government regulation which allowed greed to infiltrate their companies.
Let me first say that the Canadian system, as practiced, would not work in the US. Canada has a population 10% the size of the US, making administration that much easier. In addition the actual implementation of health care is left up to the provinces. If the US federal government was to try and administer such a system it would be a complete disaster.
I am as conservative as the next guy, but knowing that a medical problem will not turn into a devastating financial problem for you or your family or anyone else makes life a lot easier. Knowing you will never face an insurance bill or a hospital bill buys a lot of peace of mind.
We can argue about the standard of care in Canada, there are differences, but in the main the standard of care is fairly high. They do not give nearly as many tests in Canada, not only to cut costs but because the doctor's do not have to practice defensive medicine, with one eye on your chart and one eye on their malpractice insurance premium.
Yes, care is rationed and there are problems. If you go into a Canadian ER with a hangnail you will wait a long time for care. If you come in with an arm hanging off, they will get you in right away. The problem is that the guy with the hangnail expects immediate service.