"four key sets of governmental actors across the United States that can commit now to certain steps that would help to isolate President Trump should he refuse to hand over power peacefully."
Obviously, this is a call--two years ahead of any transition--to isolate President Trump now. Geltzer is proposing that the Electoral College, Congress, state governors and even the U.S. military should, effectively, assert ahead of an election that a sitting president and current candidate is a danger to the nation.
What's really going on here? I think it's a type of deflection technique. In the wake of the government shutdown shambles, Trump is polling better than ever; the public is widely supportive of his policies. The Russia Hoax has fallen flat and is largely perceived by the public to be an illegitimate politically motivated attack on the President. Further, with the McCabe revelations it's widely perceived that the FBI was involved in an actual attempted coup--an attempt to overthrow the results of a national election. The Left is now desperate to deflect attention from their won attempted coup and to direct public attention at Trump. But notice, as part of this technique they're making tin foil hat type allegations against Trump that, in fact, mirror what was going on during the 2016 election and the early months of the infant Trump administration. The difference is that to accomplish this, to direct the attention that is focused on the now patent crimes of the FBI and DoJ, the new narrative must be sensationalistic. It must be easier to assimilate than the complex maneuverings that are being uncovered at the FBI and DoJ. Thus, this latest desparate throw of the narratival dice.
Of course, there's more at stake here. It's quite clear that, while the FBI and DoJ where the lead elements in the coup effort, they were supported by a Deep State network throughout most of the leading departments and agencies of the Obama Administration, especially in the Intelligence Community. And most serious of all, this effort was coordinated with foreign intelligence services (also here, and passim) against the government and constitutional structure of the United States.