Nation Confusion on the border: Court halts Trump’s ‘Remain in Mexico’ rule then reverses itself February 29, 2020February 29, 2020 Rick Jervis and Rafael Carranza, USA TODAY Comments Off on Confusion on the border: Court halts Trump’s ‘Remain in Mexico’ rule then reverses itself The "Remain in Mexico" policy took effect in January 2019 in San Diego. Nearly 60,000 people have been sent back since the policy began.