> Generally the way to hold a president accountable is to impeach him and remove him from office.

Impeachment is a political solution to political disagreements. This opinion makes most disagreements with 'official acts' a political question, to be settled by election or impeachment.

Critically (and thankfully) it rejects outright the idea that impeachment is the _only_ mechanism restraining a president. Criminal liability is still a viable mechanism for holding a president responsible for all unofficial acts, and potentially for some official acts.