There are a lot of arguments on both sides of this issue, but there is nothing wrong in the Congress & President wanting to have an independent review of the facts in the case, especially when a life was at stake.
It seems to me that a "life issue" trumps states' rights.
An accusations of hypocricy, especially in this case, is lame.
The essential problem, it seems to me, is the meaning of "clear and convincing evidence." Judge Greer was convinced, it seems, but many others were not.