I don't know if he will or not, but if they won't fund it, I think he should. It's not only the right thing to do, but, politically it will place the Democrats in a horrible spot. How do you tell the country, you want to send dozens of billions of dollars to foreign nations in the form of aid, but, you have little interest in a permanent and much needed border wall?
People are dying, people are O.D'ing, young people in particular are losing out on entry level job opportunities, potential voter fraud. The Whole Nine. The argument that "walls don't work" and "that's now who we are" is such a weak position that I dare say it HARMS Democrat prospects in 2020, especially when many of them voted for walls in the past.
I think this is a National Emergency, and it wasn't until 2015 when many Americans on Conservative websites were giving the numbers on illegal immigrants and I heard how passionate they were regarding a wall, that I started to understand and feel empathy for those defending your border.
Honestly, Trumps campaign shed light on so many issues I never knew Americans faced. Now the whole world knows, and this is why he has much more support from every day citizens around the world than people give him credit for. I suggest that informed people with an understanding of history and todays geopolitical realities, know what the world would look like if America fails.
Build the wall, protect your citizens and economy. Period.