A judge could hold Congress in contempt, but there is no mechanism for enforcement.
In theory, the judiciary is apolitical, but we all know better by now. The discussion of Democrat versus Republican judges is dangerous for the rule of law, but then again, the courts are not the place for legislating. The issue of right versus wrong is to be decided by the people's legislature, not the courts. I should note that Earl Warren told his clerks that he didn't care about the law, only right versus wrong.
Sorry we had to overrule your unconstitutional overreach but you brought this on yourself. Meanwhile we sent you a pound of this product for you to gavel upon until your widdle feelings recover. - Your employers, the USSC and We The People