Why are folks acting like we're still just waiting for the full story to come out? This is not a "Dems said/Reps said" situation where we can't verify which group of people is telling the truth about the change. If you want to know what the change was, compare the two versions. Here's the version that passed the Senate on 6/16:
Here's the amended version that passed the House on 7/13 that Senate Republicans largely rejected:
Anyone see any difference that would justify 25 Republicans withdrawing their support?
Also, it would appear, if indeed I've found the right thing (someone can correct me if this isn't it), that the changes made in the House version were all proposed by Republicans in the House Committee on Rules:
rules.house.gov
But sure, the Democrats in the House filled it with pork, so Senate Republicans had no choice but to block it...