Who said it's immoral to use a physical wall?

 I haven't seen anything stating they mean the physical structure, can you provide a reference?

 From what I see it's about the implementation of policy, like the adult only detention process that made so much news coverage about separating alleged families, not the physical concrete.

"The wall is, in my view, immoral, expensive, unwise, and when the president says, 'Well, I promised a wall during my campaign.' I don’t think he said he was going to pass billions of dollars of cost of the wall on to the taxpayer"

 I'm not sure this means concrete is not ok and other means are.  This appears to be a blanket statement of the "Wall" and not a physical concrete structure only.

 How are you coming to the conclusion that this refers exclusively to a physical wall and not funding in general that reflects any means implemented by the requested funding?

 

 So you just believe she means only a concrete wall.

 I do not believe she means only a concrete wall.  Or more specifically I do not believe there is enough information to say she is not ok with the wall, but is ok with other means.

 I think she is against the idea of that much funding going to border security in general.

"Show me a reference to Anything other than an actual wall."

 That's why I said this:

"Or more specifically I do not believe there is enough information to say she is not ok with the wall, but is ok with other means."

 To clarify:

 She does in the referenced statement indicate clearly that she finds a complete physical wall "immoral" among other terms.  However in my assessment this does not exclude other methods as there is no reference, again: there is no reference, that she is ok with other means.

 My understanding is that you are indicating that a wall is considered immoral, but other means is ok.  

 I see no reason to believe that other means is ok, or that by saying that a wall is immoral that means all other methods are ok.  Simply put, all other methods besides a wall haven't been addressed.

 I don't think there's enough information available that indicates other means is acceptable when directly contrasted against a physical wall method.

 Its clear that a physical wall was called immoral, but it is not clear that drones are considered moral.

"If THAT'S immoral, then aren't ALL forms of stopping people from crossing illegally? "

 Maybe.  To call a wall immoral is a stretch for sure but I feel poisoning the water supply of communities where immigrants are most likely to come from is more immoral.  

 Shipping food, clean water, outsourcing jobs and medical care to communities where immigrants are likely to come from is less immoral.