This is what he cant seem to understand...
IF he gets the R ticket (doubtful.. but I suppose a possibility).. there are enough disenfranchised R's and independents that simply will not show up to vote that a very easy victory will be handed to the D's..
IF he fails to get the R ticket (probable in my opinion) and chooses to run as an I, he will take along enough loyalists (but not enough to even get close to a win), to effectively split the party, and hand a very easy victory to the D's...
If Trump runs again (which he seems absolutely determined to do), the D's could run the offspring of an orangutan crossbred with a feral pig and keep the white house.. Joe Biden, despite being clearly incapable of doing a decent job, even by D standards will have zero problem remaining POTUS..