A government source said the speech would be rescheduled in the near future.A spokesperson for the minister told the ABC the speech would "deal with the migration system as a whole"."Yesterday it became clear that some elements of the speech would not be finalised by Thursday We're working with the press club to find a new date," the spokesperson said.Three sources familiar with the government's thinking told the ABC the minister had been preparing a package of measures to achieve a quick and drastic cut to net migration