Sorry, read it again. You're incorrect, and about a dozen people have proven it with transcript quotes. The context of the question WAS the universal mandate to buy insurance. That led to Cooper's inferred question about pre-existing conditions, i.e. if Obamacare is repealed, there will be no universal mandate to buy coverage, which leads to the question about "what happens to people with pre-existing conditions. Trump proves that he understood the context of the question to be exactly that, when he responds about people "dying in the streets", e.g. people with no insurance. His response would be a
non sequitur logical fallacy otherwise.
Trump supports the mandate requiring all individuals to buy health insurance, and under the Obamacare status quo within a highly restricted, over priced market.
Trump might clarify this tomorrow, i.e. it may not be what he meant to say, but it's what his words said.
No, the context was the mandate that insurers offer plans to those with pre-existing conditions—so everyone has access to a plan.
That is different from fining people for not buying insurance.