Just a short time ago, those same Dems that are against the wall were calling for a wall. So yeah ... it’s all about opposing Trump.
I believe the change of policy was a result of the realization that the border jumpers could be turned into DemonCRAP voters. The success of this voter fraud changed the whole dynamics. I asked my Secretary of State why she can’t track down the citizenship of our electorate. She told me that the Democrats made that action illegal for her to do. This guaranteed the right to vote through motor-voter registration.