Trump repeatedly warned officials that closing the American-Mexican border could lead to billions of dollars of economic losses, destabilization of border towns and cities, and make little to stop the flow of migrants across the southern border, multiple current and former administration officials told CNN.
However, faced with the rise of illegal immigration and the optics of detention centers at the US border, Trump returned to the opportunity to take decisive action to signal that Mexico should do more. 
What will happen if Trump actually closes the border? several times since last year about the economic consequences of the closure of the US ports on the southern border, but continues to consider the idea of closing sites or the border as a whole. And some of his closest advisers encouraged him to stick.
Although the term was new, Trump threatened to close the southern border earlier. At this time, the White House officials were not ready to argue about whether Trump would be held.
"You never know," said another White House official. "No one is guessing."
The officer compared the uncertainty here and there because of the extraordinary declaration to finance the construction of the border wall, which Trump decided to do.
But officials also question the realism of the closure of the border and believe that this could be detrimental to short-term and long-term goals, including a new trade agreement, trade flow and shelter shelter policies. in mexico
Another official argued, however, that the threat was useful in pushing Mexico to a greater border on the border.
"We Will Consider" Economic Impact
The White House's Chief Economic Advisor has refused to clarify what economic implications the administration expects if Trump will close the United States and Mexico this week.
"This is something I am sure we will study and study," Kevin Hassett, chairman of the council of economic advisers told reporters on Monday. The United States and Mexico are major trading partners and, together with Canada, joined last year for the solemn signing of an agreement between the United States and Mexico and Canada, the potential replacement of NAFTA.
Hassett spoke with journalists at the White House on Monday morning and when asked if there was economic modeling to assess potential economic consequences Closing at the border, he stressed the complex and unique The subject of this question
"There are many things that are moving and both the customs service and the border patrol will deal with this, this is something we will have to talk to if we get to that," said Hassett.
He added , "Potentially, in the United States, for a while, there will be more material, but this is something we will have to talk to customs and border guards."
Hassett noted that there may be "special rules for certain types of things".
He also referred to the approach of the Bush administration to the border after the attacks of September 11, 2001. The US response to Sept. 11 included an increase in inspections and led to longer lines at the border, which happened with the temporary closure of air transport.
Legal experts were divided on how Trump could "close" the border.
CNN lawyer Steve Vladkel said last year that if Trump does this step, he can not "do so in a way that violates the rules of constitutional rights, whether they have a special national origin or those who are not citizens who have sufficient contact with the United States to call for proper protection of the process.
"For example, by categorically closing the border between El Paso and Ciudad Juarez, it would be possible to capture thousands (if not tens of thousands) of Americans and non-citizens who have the legal right to stay in the United States on the other side of the border, on if many of them had solid claims about the right to travel / return to their homeland / etc, which could cause serious constitutional problems, "said Vladek.