So, you admit he has never testified in court in his own defense? Investigations and depositions are not prosecutions. he was never charged with any crimes in thos instances, was he?
Here is what Trump said about his taking the Fifth.
"When your family, your company, and all the people in your orbit have become the targets of an unfounded, politically motivated Witch Hunt supported by lawyers, prosecutors, and the Fake News Media, you have no choice. Accordingly, under the advice of my counsel and for all of the above reasons, I declined to answer the questions under the rights and privileges afforded to every citizen under the United States Constitution."
That's how you counter a fishing expedition and perjury trap.