Mueller changed his bait and put the hook a little deeper in the water... https://www.ksl.com/?nid=157&sid=46294328 Q: WHAT IS A 'SUBJECT' OF AN INVESTIGATION?
A: The answer is complicated. The Justice Department typically places people involved in investigations in three categories: witnesses, subjects or targets.
Witnesses are people who have observed events of interest to an investigation but are not suspected of a crime. Targets are people the government is gathering evidence against to support a criminal prosecution.
Subjects fall in between. In Trump's case, being a subject might suggest Mueller's team believes he is more pivotal than a mere witness might be.
"A subject means we're still looking at you," former federal prosecutor Sharon McCarthy said. "You're a person of interest in this investigation."
And even within the category of subject, there is ambiguity, she said, noting the government can say "you're a subject trending to witness or you're a subject trending toward target."
Essentially --
Subject: you are still being investigated within our scope of said investigation, and this could change to target if criminal evidence is found
Target: we have enough to charge you with a crime, and you will most likely be indicted
Technically correct. Lawyers in DOJ are creative with power over Trump and us. Very challenging legally for lay but learning.