This is incorrect. If you think the current US posture on the southern border is unchanged from how it was under Obama you have been duped. This is the sort of lie that Trump tried to pull with the family separation policy before, attempting to claim there was no change in policy. There were SOME separations before, but not a deliberate policy of zero tolerance explicitly designed to separate children from their families in order to deter immigration.
If we're going to fix the problem on the southern border we have to be clear eyed about why it's so much more of a problem now than before. Part of it is the number of refugees has increased, but the other part is that our government has implemented wildly ineffective, incompetent policy there for the last two years. We can't fix the number of refugees easily but we can at least try and put some adults in charge down there again.