They just need to dig in until the mew Senate takes over and Flake is gone. Then vote for the rule change of a 51 vote simple majority.
See my post #58. When the new Senate takes over, the House bill from the 115th Congress will expire and the new Pelosi bill will not have the wall funding in it.
There is nothing for Republicans to dig in for, but everything for the Democrats to dig in.
-PJ