The difference between then and now is that Trump has wholeheartedly embraced the concept of shutting down parts of the federal government to force congressional Democrats to support funding for the wall.
This is infighting between GOP Senators and the White House. This can only work if they can get the public on their side and it looks like the opposite is happening.
Republicans wondering if loyalty to Trump is worth it should call Chris Christie and ask him.
From Senate Republicans Won’t Fund The Government If It Means Defying Trump