LET'S put aside the political, legal and constitutional implications of the executive action on immigration that the president will announce tonight for a moment and look at the problem that Barack Obama is trying to address. Here are all the numbers you need to have a well-informed argument about illegal immigration and deportation in America.
The Pew Research Center puts the number of illegal immigrants in America at 11.3m. If they were all in a single state it would be America's eighth largest by population, just behind Ohio. As the chart below shows, this is not a new phenomenon. Though Mr Obama's political opponents accuse him of being lax on immigration, the big increases took place before he took office.