You got me thinking which can be dangerous. Can Trump cancel the election, no he can't. But there are so many variables. One thing is for sure, Trump's presidency will end at noon on 20 Jan 2021 unless reelected. Now if you're into some heaving reading, the below article explains many situations that delaying or canceling the election could cause and who might or could become president.
It's high past time that we start electing Americans to congress and the presidency who put America first instead of their political party. For way too long we have been electing Republicans and Democrats who happen to be Americans instead of Americans who happen to be Republicans and Democrats.