News Federal court temporarily halts Trump’s ‘Remain in Mexico’ policy — then reverses itself February 29, 2020 Rafael Carranza and Rick Jervis, USA TODAY Comments Off on Federal court temporarily halts Trump’s ‘Remain in Mexico’ policy — 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.