Trump, for his part, withdrew a threat to impose a five percent tariff on all Mexican imports, beginning Monday and escalating to 25 percent by October.

Commentators suggest this is the "safe third country" arrangement, under which migrants would have to apply first for asylum in Mexico, rather than the United States, and be turned away if they do not. The official spoke on condition of anonymity to share details of closed-door talks.

Mr Ebrard said the USA facet also wished to designate Mexico as a "protected third nation", which would have required Mexico to soak up asylum seekers heading for the U.S. and direction of their claims by itself soil. "And, specifically, the Democrats, they have to get their act together", he told reporters at the White House.

In the deal, Mexico agreed to send 6,000 members of its newly formed militarized police to patrol its porous border with Guatemala.

The U.S. -Mexico migration agreement reached last week includes a regional asylum plan and Mexico's commitment to examine and potentially change its laws, according to a copy held up to journalists by President Donald Trump on Tuesday. USA officials had been working to expand the program, which has led to the return of about 11,000 to Mexico without Mexico's public embrace. "We now have the capacity to this full throttle and engage this in a way that will make a fundamental difference in the calculus for those deciding to transit Mexico to try to get into the United States".

The lawsuit claims the administration has shifted away from the "safe release" policy that provided asylum-seeking migrants with basic assistance and necessities until their assigned court date before an immigration judge, and that shift has placed a heavy burden on New Mexico state and local governments.

"The President is doing precisely what he said he would do", he said.

Mr. Trump echoed the same in his tweets, insisting the deal was being misrepresented and demanding more credit from the press.

"There is now going to be great cooperation between Mexico & the U.S., something that didn't exist for decades", he tweeted Sunday. "You know, people talk about collusion". Aside from the significant uncertainty that recurrent negotiations over possible tariffs will create for businesses and their supply chains on both sides of the border, the possibility of tariffs will also complicate the Mexican leadership's political future.

Mr Ebrard said the U.S. had been insistent on this measure. That's a lot. And we're moving along very rapidly.

"It won't stop migration because, one way or another, migrants are going to get through".

US border officers apprehended more than 132,000 people crossing from Mexico in May, the highest monthly level since 2006. She told CBS' "Face the Nation" that the countries' "joint declaration of principles. gives us the base for the road map that we have to follow in the incoming months on immigration and cooperation on asylum issues and development in Central America". It resembles a suit filed by San Diego County in April also challenging the cancellation of the federal immigration program that helped migrants with phone calls and other travel logistics as they pursue final destinations across the U.S.