Funny, because the administration testified in court that it was a mistake that he was sent. Claiming the stay was illegal was retconned after the fact, not the cause for the deportation.
The claim that administration supporters are now using is that the legal 'administrative stay' placed upon him was illegal, That is what 'stay' means in the context of what I said, not his 'stay in the country'. Maybe don't get so righteous next time especially when you don't bother to understand what someone says.