Trump’s backers believe that the expression of mere hopes is not the same as obstructing justice, but there are arguments showing that “I hope” could be enough. Law professor Dan Epps from Washington University in St. Louis put it plainly:
Lots of ways in which "I hope" can convey a threat. "Nice store you have here. I hope nobody burns it down."
In response to that tweet, New York Times Supreme Court reporter Adam Liptak cited the case United States v. Collin McDonald, where the defendant was found to have obstructed justice based, in part, on a statement where he said to another person in a threatening letter:
I hope and pray to God you did not say anything about a weapon when you were in Iowa. Because it will make it worse on me and you even if they promised you not to prosecute you that’s not always true I would hate to see you go to jail…
A response to Liptak included another judicial opinion, this one from the Fifth Circuit Court of Appeals, where a person was found to have the “intent to an impede an investigation,” when they said to a witness, “I[‘m] just hoping you haven’t told anyone anything…. Like, ya know, talking or anything like that. Just don’t ah ya know?”