David Gibbs, the Schindler's lawyer, only filed for a temporary restraining order, not for a de novo hearing. What the congresscritters appear to be angry about is that the judge failed to give the Schindlers something they didn't ask for in the first place. It's posturing.
And frankly, the congressional bill they did pass was almost certainly unconstitutional. Michael's attorneys didn't bother with that argument, as far as I know, because the Schindlers attorneys showed up at a gunfight with a water pistol.