They can quietly pass it now but when Trump vetoes it they will have to step up if they want to override and be identified.
You never know with the GOP what their real intention is. There are two possibilities here:
1)They really are going to pass the bill and stick to to Trump and the GOP base.
2)It’s not going to become law and the GOP want to show their big donors that they tried.
I always assume the worst when dealing with the GOP so we need to fight this.