The Trump administration has long sought such an accord with Mexico as a means of resolving what it has termed a "crisis" of an escalating number of Central American asylum applicants - and limited detention space in which to hold them on us territory as their petitions are considered.
Irineo Mujica, who has accompanied the migrants for weeks as part of the aid group Pueblo Sin Fronteras, said the aim of Sunday's march toward the Mexico-US border was to make the migrants' plight more visible to both governments.
In practice, that would bar most asylum seekers who entered Mexico from filing asylum claims in the United States. Other than that our very strong policy is Catch and Detain.
Moreover, she said Mexico's new government had rejected any deal in which Mexico would be considered "a safe third country" for US asylum applicants.
Asylum seekers will be given an initial screening to determine whether they face imminent danger by staying in Mexico, where violence is widespread.
All US-Mexico border traffic has been halted at the busy crossing between San Diego and Tijuana, the US Customs and Border Protection agency has said.
She said she was considering accepting Mexico's offer to stay and work in Chiapas as a refugee.
Trump ordered to allow CNN journalist back
But he left open the possibility that Trump could revoke Acosta's press pass again, if due process was given. But the judge also emphasised the "very limited nature" of his ruling Friday.
United States officials will be able to process at least twice as many asylum claims under the new system because they would not be limited by detention space at U.S. ports of entry, the Post report said. "If for any reason it becomes necessary, we will CLOSE our Southern Border", Trump posted.
On Friday, Tijuana's mayor, Juan Manuel Gastlum, declared a humanitarian crisis in his city of 1.6 million, which he said was struggling to accommodate the crush of migrants.
More than 4,000 migrants are already in Tijuana on the Mexican side of the border, with more on the way in caravans.
Thousands of Central Americans who have trekked through Mexico arrived in recent days to the border town of Tijuana, hoping to cross into the US.
In video captured in Mexico, hundreds of members of the caravan could be seen marching across a canal toward the border.
"They will also give us dates, on what terms they will receive the (asylum) requests and in the case that they are not beneficiaries of this status, they will have to return here", Vences said.
Robledo said the incoming government wanted to find jobs for Central American migrants in sectors that are short-staffed, such as maquila assembly plants.
- How Pelosi battle reflects Democratic frustration over leadership 'bottleneck'
- Don't eat romaine lettuce: Health Canada
- The John Lewis Christmas advert 2018 has finally arrived - see it here!
- Wayne Rooney 'embarrassed' by the end of his time at Manchester United
- Netanyahu says ‘unnecessary and wrong’ to call snap Israeli polls
- Washington Redskins signing Mark Sanchez after losing Alex Smith
- Warriors star Stephen Curry involved in multi-car accident
- Finnish president confirms forestry chat with Donald Trump
- Protectionism 'doomed to failure', Xi Jinping says in swipe at US
- Bobbitt, couple charged in homeless GoFundMe case