Agents are still doing medical screenings and criminal checks, but the decision means thousands of families will be released without first going through U.S. Customs and Immigration Enforcement.
Most immigrant families coming to the US don't plan on staying in the border towns they cross through, but rather to meet up with family throughout the country.
Mexican President Andres Manuel Lopez Obrador said on Thursday that tackling illegal immigration is an issue chiefly for the United States and Central America to address.
"Mexico is doing NOTHING to help stop the flow of illegal immigrants to our Country".
On Wednesday, Customs and Border Protection Commissioner Kevin McAleenan, the nation's top border official, said that the nation's southern border is at the "breaking point".
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Trump pledged new investigations but did not specify who would conduct them or who should be targeted. Congressional investigations also are swirling around the president.
Democratic and Republican lawmakers have fought over whether there actually is a "crisis" at the border, particularly amid Trump's push for a border wall, which he claims will solve immigration problems. "Historically, the vast majority of aliens we encountered were single-adult males from Mexico who could be quickly removed after a short period of detention if they had no legal right to stay", she wrote. "We are a great neighbour", he tweeted in Spanish.
Mr Trump's latest tweets ramp up the tension between the neighbours, putting a specific timeframe to his threats to shut the border, one of the busiest in the world. The Department of Homeland Security wants the authority to detain families for longer and more quickly deport children from Central America who arrive at the border on their own. "We don't in any way want a confrontation with the USA government". "Mexico has for many years made a fortune off of the US, far greater than Border Costs", the president wrote, without elaborating but presumably referring to what he has called Mexico's trade advantage over the United States.
An incomplete section of border fencing as seen from the Texas side during Acting Secretary of Defense Patrick Shanahan's tour of the US-Mexico border in El Paso, Texas, Saturday, Feb. 23, 2019. He reports, "And the border patrol is saying they're drowning".
A request for comment made to DHS about the president's contradictory tweet and any repercussions on the regional compact was not immediately answered Thursday. Congress passed legislation to block the emergency declaration, but the president vetoed it, which the House was unable to override.
"It could be a couple of hours, it could be more than that, it could be overnight, I can't tell you, it's just too many people for me to tell you an exact time or time frame", Cordero said.