“.....Presidential issues aside, it seemed many of Mueller’s questions are about what Trump was thinking during a particular event. Is that something a court can compel ANYONE to testify to? Do we lose the privacy of our own thoughts when we take the stand?......”
By asking Trump what his thoughts are then Mueller wants to use that to establish INTENT toward obstruction on any thing else he wants to charge the President with.
After all, Hillary didn’t have Intent, but Trump will.