Donald Trump’s threat to shut the US border if Mexico does not halt all illegal immigration has exposed the limitations of the new Mexican government’s strategy of trying to appease the U.S. president as he gears up for re-election.
Amid a surge in migrant detentions at the southwest US border, Trump on Friday said he would close the 2,000-mile (3,200-km) frontier, or sections of it, during the coming week if Mexico did not halt the flow of people.