Republicans have 50+ votes in the senate and already passed a bill in the house. All they would need to do is consider re-opening the government as important as appointing a supreme court justice and modify filibuster rules (which only require 50+ votes and they did change for supreme court [1]).

Democrats obviously can just vote for the Republican bill.

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Although personally, I'm fine with Democrats refusing to vote for a bill they had no input on.

[1]: https://en.wikipedia.org/wiki/Nuclear_option#2017:_Cloture_o...