What gamble? Trump never claimed to be invulnerable.
Every body is mortal. It’s an absolute certainty that they will die, and while one should try to prolong life, it is impossible to gain without risk. So all of life is a gamble. Conservatives are OK with that. Leftards are not, and believe that they can stave off death indefinitely. In the Harry Potter book of life, they are the death eaters, who like the death eaters, are obsessed with genealogy, scorning “mudbloods” and favoring “purebloods” and willing to kill to avoid death themselves.