Take it one step further and ask “Why?” The reason seems simple: they now see giving Trump his border money as a cheap way to get those people now in the US registered as democrat voters, which is all they care about anyway. They now figure if they can take the WH in 2 years there won’t be all that much wall to tear down when the open the borders completely.
Perhaps. In fact he should promise them he will and then not do it after he gets the money.