[Still Thinking]

and why should the Supreme Court take orders from Obama?

Exactly. I'm pretty sure THEY'VE heard of separation of powers.

[Conscience of a Conservative]

Not a separation of powers issue. The administration fied a legal brief, arguing for a certain position ( that the execution should be halted). The administration’s position is, as usual, dead wrong, but the fact that they filed a brief is not a separation of powers issue.