The history: The Rubicon is the river that Julius Caesar crossed when he moved from being a general to the dictator of Rome: https://en.wikipedia.org/wiki/Crossing_the_Rubicon
I don't care much for the idea of a second Trump term. How about a third or fourth Trump term? The Constitution limits Presidents to two terms in the 22nd Amendment. The Constitution also says "no" to insurrectionists; If the Supreme Court won't enforce the insurrection clause against Trump, what makes you think they will enforce the 22nd Amendment against Trump?