Cohen: This Halloween, Trump should be afraid of Robert Mueller

And so, on the 258th day of Donald J. Trump’s term of office, we reach a watershed. The slow unravelling of his presidency has begun.
It is not the indictments alone of Paul Manafort, Trump’s former campaign manager, and Manafort’s associate, Rick Gates. Or the guilty plea of George Papadopoulos, a junior foreign policy adviser.
If they were the whole case that Robert Mueller, the special counsel, was building against Trump, there would be calm in the White House.
In fact, for