Hear me out, if trump does get impeached, precedent will then be set. If the federal reserve is unconstitutional, this would open a door to impeach every president since then, not to mention all laws and amendments would then be subject to review and possible overturn. At that point it would seem trump would sacrifice his future term as president, for the greater good. (Not completely sure if he would be able to run again depending on laws passed since Ulysses S. Grant, the 18th president)