There are some very good comments in this section. What must be emphasized is that Trump does not merely 'lie'. Trump does not have enough respect for the truth to lie. He subverts truth by blowing smoke, any smoke at all, to convince someone of something at that time. The next someone, the next time, will be different. And it is on the table that the man is mentally ill. Trying to understand his positions as part of a system of beliefs is going to go right off the rails, because THERE ARE NO RAILS. He's a locomotive with no tracks.