https://www.yahoo.com/news/warming-islands-mice-breeding-control-050346483.html
Instead of rat poison (which lets admit it, would be appropriate) they need to work on some sort of truth serum nuggets.
Once exposed to the truth and following the violent visceral reaction to it, trumplicans could once again become normal people. The problem of course is that the trumplicans avoid truth facts intelligence instinctively. The solution will be convince them that the truth nuggets are actually trump turds and they will
voraciously gobble them up.