General Discussion

but the actual execution of the act will be treated as criminal.

As usual, those committing the acts will probably, at the very least, face investigations. The "grunts" will have consequences without protection of immunity or pardons. Whereas, those Cabinet members giving the orders will probably have immunity from prosecution covered either by extension of Presidential Immunity or pardons.
This is why pursuing State charges or the U.S. Government granting or recognizing the I.C.C.'s authority is so important.