Rep. Jim Sensenbrenner wants to build a wall on the southern border, and in a slight twist from President Trump’s famous campaign pledge, he wants to make Mexican drug cartels pay for it.

The Wisconsin Republican’s plan relies on funding from civil asset forfeiture, a process by which law enforcement can seize money they suspect is linked to drug trade, even before a case involving the person goes to trial. The tactic has grown controversial among some conservatives who argue it violates due process rights, but his plan has the political appeal of targeting a most unsympathetic category of criminals.