.
>> “Of course they have the authority. They get to decide whether the President is following the law that congress has passed.” <<
Balderdash!
The separation of powers prevents the court from interfering. There is no US citizen affected by the order, thus the court has no venue.
.
So congress has no power at all? Congress makes the law the Executive Branch enforces it. The Judicial branch interrupts any disputes and where or not it’s constitutional.
If you are arguing standing that’s a different issue. But the Judicial branch has authority over any and all laws that Congress passes.