Of course the harm is enormous; and multifaceted!! 

Already the roll back of climate change provisions has signaled to the entire world that without US participation the battle is effectively lost. Quite literally in Canada that argument is being used by some parties as an excuse for not following through with our fledgling efforts. Strange as is it might sound, I think that China may now become the leader in this effort. 

As as best I can make any sense of Trump's health care replacement, the effect will be to return to the situation where the poor have no care, and costs per capita are higher than anywhere else in the western world.

Lesia, my theory that Trump is best understood as driven by his internal neuroses, and his enablers are your standard drones attracted to power was not meant to JUSTIFY the evil that will result, but merely to explain. The Canadian PM appears to understand that, refusing pressures to condemn Trump. One must dissemble to effectively deal with neurotics.