Task: Translation
Input (Japanese): 変化への反対者は今回の立法阻害は、Caucusによる1980年代初頭以来の抜本的移民改革推進への努力だと語る。
Output (English): Opponents of the change state that recent legislation blocking is part of the Caucus' efforts to push for comprehensive immigration reform, not seen in the U.S. since the early 1980s.