Experts say that the immunity argument, though, will be tough for the Trump administration to justify — and the reference to the Clinton v. Jones case is particularly puzzling.

Two major Supreme Court cases, one under President Andrew Johnson and one with President Richard Nixon, held that presidents have broad immunity when it comes to their actions in office.

…”Generally speaking, things done before the President is president, in the President’s ordinary capacity, there’s no special immunity from suit,” said University of Chicago Law School professor William Baude, who works on immunity. “(The concept is) about preserving your ability to do your job; it doesn’t apply before you had your job”

Trump claims immunity as President in lawsuit – CNNPolitics.com

hmmmm