I honestly wonder who they are hitting up in congress to get it done. Definitely isn't the leadership, so it has to be the moderates.

Assuming all democrats vote in favor (optimistic scenario in the senate, but they have been hanging together or they will hang separately), then we do need 12 republicans, question is: who?
Co sponsors:
1. Graham (R-SC)
2. Flake (R-AZ)
3. Murkowski (R-AK)
4. Gardner (R-CO)

That makes it 8 to go.
5. McCain (R-AZ), Lame duck, supported it in the past, doesn't like Trump, likely yea.
6. Hatch (R-UT), Supported/Sponsored in the past. Pushing his own Succeed act nonsense. Hopefully a yea when it comes to it.
7. Collins (R-ME), has been pretty moderate lately, hopefully a yea.
Possible yeas with border security:
8. Alaxander (R-TN)
9. Heller (R-NV), basically a lame duck at this point, ratings in NV are down the shitter
10. Corker (R-TN)
11. Hoeven (R-ND)
12. Rubio (R-FL) ?????
13. Cornyn (R-TX) ?????
14. Lankford (R-OK)
15. Tillis (R-NC)
16. Toomey (R-PA)
17. Ernst (R-IA)

House might be easier, we have all 194 democrats on board and about 5 republican co signers. Finding 17 more probably won't be that hard, especially if senate votes first.