In what we used to think of as “normal” political circumstances, the presence of an incumbent president running for re-election would scare off potential challengers.

Donald Trump, though, has torn up and tossed out political norms. He did so with that amazing 2016 presidential campaign. He’s doing so yet again by attracting a potentially huge field of possible foes who would challenge his effort to win a second term.

Trump was elected president in the first campaign for public office he ever sought. His entire adult life has been centered on garnering wealth, promoting himself and assorted other matters related to self-enrichment and self-aggrandizement.

He is in some trouble politically. Questions are swirling around him. A special counsel might be wrapping up an investigation into whether his campaign colluded with Russian operatives who attacked our electoral system.

There might be a whole lot to reveal once Robert Mueller finishes his probe. Thus, we have this potentially gigantic field of Democratic Party challengers. There even might be some Republicans willing to challenge Trump in the 2020 GOP primary.

What is politically “normal” these days? Judging from the size of the field that might be shaping up against Donald Trump, I would say, um, there is not a single thing normal about the upcoming presidential campaign.