From UCMJ Article 71: "a) If the sentence of the court-martial extends to death, that part of the sentence providing for death may not be executed until approved by the President. In such a case, the President may commute, remit, or suspend the sentence, or any part thereof, as he sees fit. That part of the sentence providing for the death may not be suspended."
I don't think that there will be any problems with this.