Task: Translation
Input (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.
Output (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。