Because it’s well known throughout the U.S. Criminal Justice System that a prosecutor can literally fabricate a context whereby a defendant can be manipulated into the appearance a lie, even though he or she truly believes they are telling the truth. This is exactly what happened to General Mike Flynn. See FBI Docs Reveal: “Flynn Was Not Lying or Did Not Think He Was Lying”
“… a grand jury would ‘indict a ham sandwich‘,
if that’s what you wanted.”
— Solomon “Sol” Wachtler is an American lawyer and Republican politician from New York. He was Chief Judge of the New York Court of Appeals from 1985 to 1992. Wachtler’s most famous quote, made shortly after his appointment as Chief Judge, was that district attorneys could get grand juries to “indict a ham sandwich.”
Mueller et al. know that they can acquire enough evidence on Trump for an indictment in a sit-down interview with him. That’s because they could do the same thing for every American alive today. The justice system is literally set up for the officers of the court to game. They use the structural advantages of “the system” to exploit defendants and suspects alike, all day long across the country. And Trump might even be easier than most to catch because he is not known to measure every word before spoken. Prosecutors love that and would have a field day with Trump.
There are other reasons why Mueller wants Trump in a room with his seasoned investigators which are well beyond the scope of this short analysis.
State of the Nation
December 16, 2018