If true, could it be a way to prevent him from taking the Fifth in an “interview” about someone else as a perjury trap?
You can take the fifth whenever you like. You are under no obligation to tell investigators anything. Don’t ever talk to cops (unless they marry your daughter.)
“If true, could it be a way to prevent him from taking the Fifth in an “interview” about someone else as a perjury trap?”
Exactly. This smells like a trap in the making. Mueller wants to try to get Trump off guard so that he will make some kind of mistake or misstatement that he can use against him in the future.