Senate Majority Leader Harry Reid said Tuesday he is willing to bring up climate change legislation ahead of an immigration bill, a possible first step toward resolving a dispute with Senate Republicans that threatens to derail a bipartisan effort months in the making.

But Republican Sen. Lindsey Graham, still angry that Reid considered putting off the climate bill, said nothing has changed. The majority leader appears not to be serious about either the climate bill or the immigration measure, said Graham. He has threatened to withhold support for the climate bill if Reid pushes ahead first on immigration.