It's interesting that the term "Crossing the Rubicon" is being used with regularity as of late.  The Rubicon river was the border between Cisalpine Gaul Gallia est omnis divisa in partes tres) and the Italian provinces.  Caesar's position was such that he had control of his army only in the province under his command (Gaul), but no where else.  Leading his army into another Roman province was treason to the Senate, and by implication, the People of Rome.  The Senate had become hopelessly corrupt, and had betrayed the people (Cicero's Orations Against Cataline are an example of this).  Caesar's men agreed to a march on Rome.  In the end, Caesar slayed the corrupt dragon and its armies, but paid for it with his life.  
 There are many historic figures that may be compared to Caesar, not least of whom is Lincoln.  Trump, in the end, may also be added to that list.
 Caesar crossed the Rubicon on Jan. 10, 49 BC.  Today, the new Congress is sworn in on Jan. 6, 2020, and the President is sworn in on Jan. 20.  If there is no new POTUS on Jan. 6, this means there is no new Congress either (think about the implications).  So, there is the possibility that, between Jan. 6 and Jan. 20, there is a POTUS and no Congress.  With no Congress, there is no Speaker of the House.  An Insurrection Act evocation will be entirely justified under such a circumstance (it already is, actually).  
 Trump faces a similar situation to Lincoln, and should deftly deal with it as Lincoln did.  Trump is not facing a rebellion of states (Trump won the swing states, and many others).  What is going on is a communist power-grab, and must be seen as such.  While Trump is working hard to exhaust Constitutional solutions, it is clear that the mechanisms provided by the Constitution are failing via criminal incompetence, cowardice, myopic greed, communistic idealism, and foreign influence.  In such a situation, Lincoln's solution is the correct one.  The Constitution must not be used as a vehicle of national suicide, as the Nation made the Constitution - the Constitution did not make the Nation.
 The Rubicon must be crossed before Jan. 20, as indecision combined with communist usurpations of power they don't yet have, will lead to a communist blood-bath over a period of a few years.  Alexander Solzhenitsyn said that the greatest regret of every man imprisoned in the vast Gulag Archipelago of woe and death is that when the communist thugs came at 4am, that they hadn't fought back with anything they had, and had preferred death to communist slavery.  Better dead than Red.