Sanders said the two sides had "made a lot of progress" but not enough.
Short said specifically that the administration wants Congress to change USA asylum laws that "allow families to basically come across the border and be protected and let go into our United States until the adjudication process completes". He wrote that the "Tariffs scheduled to be implemented by the United States on Monday, against Mexico, are hereby indefinitely suspended".
Short praised Mexican officials for floating new ideas about how to stem the flow of Central Americans traveling to the USA over the past two days of negotiations, but said there is still "a long way to go" to satisfy Trump's demands. Mexico offered small and so far undisclosed concessions; the U.S. demanded major action.
Talks had gotten off to a shaky start Wednesday, as the United States once again pressed Mexico to step up enforcement on its southern border with Guatemala and to enter into a "safe third country agreement" overhauling its asylum system. It wants to force Mexico to adopt the "safe third country" standard that the USA already has with Canada.
Most are families from Guatemala, Honduras and El Salvador, who understand that if they cross the border and are detained, they will likely be processed and released into the United States, whether they ask for asylum or not, according to Border Patrol Chief Carla Provost. It was unclear, however, what - if anything - Mexico had changed.
Many members of Trump's Republican Party and business allies have urged him to reconsider - or at least postpone the tariffs as talks continue - citing the potential harm to American consumers and manufacturers.
Trump faced a Friday deadline to sign an executive order to ensure the tariffs go into effect by Monday, his deadline for Mexico to meet his immigration demands or face a 5% tariff on all exports to the US.
'Our position is still the same and we're moving forward with the tariffs. The question is whether it will be cheaper to enforce a "safe third country" policy than to deal with the economic damage of a trade war with the US.
In Mexico City, at his daily news conference, Lopez Obrador complained forcefully that the American team continues to see immigration as a law-enforcement issue without taking into consideration the hardships that force people to flee home. Pence on the morning of June 6 told reporters that Mexico needs to do more to address the illegal immigration situation, though he noted that the previous talks were positive overall. "President Trump proved he wasn't bluffing, and his bold leadership just resulted in a huge win for America's safety and security".
The key to an agreement that will satisfy Trump might not be trade anyway.
"Mexico will try very hard, and if they do that, this will be a very successful agreement for both the United States and Mexico!"
"The United States will immediately expand the implementation of the existing Migrant Protection Protocols across its entire Southern Border", the two countries said in a joint declaration following three days of talks.
A group of migrants traveling in the Central American caravan, walk alongside the Mexico-US border fence before trying to cross to San Diego County, in Playas de Tijuana, Baja California state, Mexico, on December 12, 2018.