Hillary Clinton and her aides were NEVER subject to the scrutiny or legal jeopardy that they are trying to hold Trump to, despite that there is a fraction of the evidence against Trump that exists for a case against Clinton. Hillary and her aides were never subject to testifying under oath. Their testimony was not even recorded.
There is no crime Trump can even be accused of, so the Meuller investigators are trying to MANUFACTURE a crime to accuse him of, in the form of a perjury trap.