POTUS should just play a little political mindfuck with the Dems at this point:

1) Would you include $5.7 billion to build a new steel barrier?

or

2) Would you include instead $5.7 billion to repair the existing barrier?

or

3) Would you include instead $5.7 billion to tear down the existing barrier?

IMPORTANT: They would have to answer each question.

POTUS should work a deal with Israel to have them refund $5.7 billion in aid for him to build the wall. That way it's not the American taxpayer paying for the wall but Israel, since it's Israel's money at that point. Plus Bibi owes POTUS a solid with that Embassy move.