This is an absolutely critical moment for Donald Trump's presidency

Donald Trump has been president for 577 days as of today. One year and seven months, to the day, of what can be described without exaggeration as the least predictable presidency in modern history. And yet, for all the wackiness and whip-sawing of these first 19 months, there's a very credible case to make that the next two-ish weeks are the most critical of Trump's presidency to date -- and will set a course for the remaining years of his presidency that will be very difficult to alter.