The theory of exercise of presidential. powers can't be a crime is absolutely false. Imagine if FDR using his power as commander in chief pulled off an invasion of europe called D-day, scheduled for june 6 1944. And if FDR using his presidential power to declassify information, told everybody about the invasion, including where, when and how.
And as a result hundreds of thousands of american troops got slaughtered. No crime by the president. right? Just using his presidential powers, therefore no charges can be brought against him?