article_snippet: The distinction -- and whether it can legitimately be used to shut out Congress -- turns on complicated and unresolved questions of constitutional law.
article_snippet: But legal experts say that though a court challenge along the lines of pending GOP cases on immigration and health care is possible in theory, it would be a long shot.
article_snippet: There is no currently no suit on the issue being discussed on Capitol Hill, and it's far from clear that Republicans would be standing on firm legal ground with such a challenge.
article_snippet: The debate, rumbling for decades, has yet to be definitively resolved in case law.