From Vanity Fair:
The president has plenty to worry about if Mueller issues a subpoena — and even more to fear if he doesn’t.
Without a doubt, Mueller is Trump’s archnemesis. Even so, it remains to be seen whether Mueller can prevail against Trump.
Only time will tell.
Whatever the outcome, it’s easy to imagine that Mueller will feature in Trump’s worst nightmares for some time to come. Even to me, as an onlooker with no skin in the game, the very name Mueller now has a foreboding ring to it.