no; there is no express wall building power in our Constitution. there is no immigration clause either. There is a Commerce Clause and a naturalization clause that could ensure we generate revenue not lose money, like lousy capitalists do.
There is no words of capitalism, socialism fascism, communism or more isms in that document. But we live with some realities. The wall is general welfare. To protect the citizens. Now in reality we need to go to war.
No, a wall is not a general welfare item; it may be a general warfare item or a common defense item. We don't have a common defense problem on our border; we do have a refugee problem.
A refugee problem that morphs into a serious breach of our soverignty, poses a security risk, over runs our social services without the citizens ok, causes danger to the welfare of our citizens, creates an unbalanced situation, tempt's bad people into exploiting the problem in many ways, creates vulnerability, creates child abusive situations, creates strife, creates second class citizens or the thought of such things by those affected by it all, and so on and so forth. The political class in bed with the donor class creates exploitable situations that American's end up paying for in more ways than can be imagined.