A lot of adjectives can be employed to describe Trump.  Mesmerizing is not one of them.  If you mean that a person derives Schadenfeude from watching the spectacle then yes, because you see the spectacular train wreck and know what will happen.  The particular crash and pileup is of curious delight. 

I prefer to leave mesmerizing for phenomenon like the Northern Lights, Alaska's birds and the return of the salmon each year.