…this would mean that a president could assassinate a rival in the name of #NationalSecurity, then avoid impeachment by intimidating members of Congress w/the threat of murdering them as well, & thus be immune from prosecution forever. …& if by some miracle a president who murdered his political enemies were removed, prosecutors would not only be barred from trying him but would also not be allowed to use his conversations w/executive-branch ofcls as #evidence against him.