You mentioned that this push came from an Alaskan senator? Do you know which? As I recall, the Republican conflict involving one of them got rather fratricidal a few years back. Lisa Murkowski was forced to run in 2010 as an write-in candidate against a Tea Partier (Joe Miller) after losing the party nomination and trounced both her Republican opponent as well as the Democratic opponent. Miller challenged the results in a prolonged series of three lawsuits that were ultimately ruled by the state as being more interested in securing his own victory than upholding the constitution. Miller went on to challenge the other Alaskan senator as a Republican in the 2014 primary, again losing. Finally, he went up against Murkowski again in the 2016 elections after he defected to the Libertarians (but still kept all of his Republican positions, including open support for Trump and policies on abortion and same-sex marriage). You'll notice that Murkowski's name came up a lot earlier in this thread during the health care votes as one of the Republicans who opposed Repeal and Replace as well as the skinny bill, and even earlier in opposition to DeVos. While she wasn't a fan of the ACA originally and some of her other positions are mainstream Republican, she's not a Trumper by any measure, so it wouldn't surprise me if she was the one who fronted this measure.