When there is a gross miscarriage of justice and malfeasance I would hope the POTUS would get involved before these guys are killed.
1. IF there has been a gross miscarriage of justice and malfeasance IN THE COURSE OF THE TRIAL. What government bureaucrats in DC do has no bearing on that unless it can be shown in a court of law that they withheld, tampered with, mismanaged, or otherwise messed up evidence directly bearing on the case.
2. Every convicted felon claims there has been a gross miscarriage of justice and prosecutorial malfeasance in their cases. They all are at some risk of being injured or killed in prison. Do you expect the president of the United States to "get involved" in every criminal case? Or do you just draw the line here because this is related to illegal immigration? Just where is the line you draw before you toss out the Constitution?