One policy under increasing implementation and discussion is a “remain in Mexico” approach to asylum seekers.
In contrast to US/Canada where there is a safe country agreement, there is not that specific agreement with Mexico. Under terms of the US/Canada accord, asylum seekers must make their claims at the first safe country they encounter. For example, asylum seekers who crossed Canada to the US could be returned to Canada (or similarly those traversing the US to get to Canada).
The US has pushed Mexico for a similar agreement. While not formally established, there may be some informal understandings including negotiations December 2018 and recent tariff blackmail episode
In January, the US started a pilot program
Despite appeals, most are denied when citing violence in Mexican border cities
Over two hours on June 1, a Honduran teenager named Tania pleaded with a U.S. official not to be returned to Mexico.
Those waits could be as long as a year
"I don’t know how we’re going to be able to afford to stay in Juárez for that long," a father of three said. "It’s dangerous here for migrants."
Lawsuits were filed and a district court briefly halted the policy for a few days in April. However, the 9th district could allowed it on appeals
10,000 asylum seekers sent to Mexico under controversial policy from Home - WCBI TV | Telling Your Story
Seems to affect migrants arriving in San Diego, El Paso and Calexico