"If Mexico does not immediately stop ALL illegal immigrations entering the US throug (sic) our southern border, I will close the border or much of the border next week," he tweeted.  Tweets follow a period in which the Department of Homeland Security and Border Authorities have said their resources have been strained.
For the past two weeks, customs and border protection have announced that they will trigger migrants in Arizona, as well as the Del Rio sector and the Rio Grande Valley region of Texas. And more people are expected to be arrested at the border in March than any month since 2008, CBP says.
After arriving in Florida on Friday afternoon, Trump said he could close the border for a "long time" and insist that the United States had gone out of custody of undocumented immigrants.
"We have the weakest and most pathetic laws," said Trump, threatening to close the border if two current immigrant residents cross into the United States.
"We've run out of space. We can't keep people everywhere. Mexico can stop it so easily," Trump said.
What Closes the Limit "Mean? Immigrants who cross illegally told a senior official on Friday that this plan will not completely close ports on the southern border so far. [1
9659] The Department of the Interior moves officers from the ports to help with the mission between ports, which will lead to slow cuts,
But the official said that full termination of entry ports is "on the table."
"It is short at the moment of full termination of a port, we continue to operationally assess what is needed. But I think what the president makes clear is with these numbers, if we are to close ports to fit all the numbers that come, we will do it so it's on the table, "the official said. what we do is a very structured process based on operational needs to determine how many additional employees we can draw from other tasks to solve the crisis between ports. "
The official said the Department of Homeland Security" looks like it from an operational perspective "and that the Department of Homeland Security Secretary will make a" recommendation accordingly "to the President. "
Will closing the boundary trunk flow of immigrants illegally crossing into the United States?
The DHS official said co-operation with Mexico and changing resources may begin to hamper the flow. ] However, part of the current crisis seems to be the number of individuals and families seeking asylum in the United States, often seeking asylum seekers to cross illegally in the United States pending their finding and treatment by a border broker. to capture these immigrants once they have crossed, but it is unclear whether their presence will make them more likely to avoid crossing in the first place.
It is also unclear whether the closure is limited to crossing In and out of the US If it includes transnational trains and trucks that import and export goods with Latin America, a closure may pose a major threat to international trade. 
Will Trump make his threat better?
The president seems to be hinting at news that comes during a border press event in the coming weeks, at least that's what he told Fox News been Sean Hannity earlier this week.
"For two weeks, I'm going to a location that's going to be in California. Believe it or not, they're begging us to build in San Diego and asking us to build a wall. And we're just in the process completing a great stretch of many miles of wall, and we need a press conference there just to show people that … these are really good things, "Trump said.
He also dreamed the visit to a rally in Michigan Thursday.
Trump tweeted in December that the US will be "forced to close the southern border completely if the obstructive democrats do not give us the money to complete the wall and also change the ridiculous immigration laws that our country is saddled with." But he didn't close the border.
The president said at the time that "if we find that it is uncontrollable" or it comes to a point where "our people are going to be hurt, we are closing in for a while until we can Get it under control. "
" The whole border. I mean the whole border, "Trump said.
But again he did not good at the threat at that time.
CNN's Geneva Sands, Priscilla Alvarez, Emanuella Grinberg and Mariano Castillo contributed to this report.