Trump wants to build the border wall because of a promise he made to the people during his campaign. If it is really built, it will also be a brilliant achievement during Trump's administration. It is equivalent to the construction of the Great Wall by Qin Shihuang of China. It can be famous throughout the ages.
In fact, building the border wall is not Trump’s original idea. All governments have built border walls. But Trump is the most extreme and tough. Trump promised the American people to build a border wall during the election, but he did not take into account the financial problems of the United States. The budget he gave himself for building the wall was too high, which caused turmoil in the United States and caused a sensation.
Trump wants to build a perfect society by building a border wall, in his opinion. Drug crimes are caused by illegal immigration from Mexico. As long as the border wall is built, there won't be so many problems anymore. Trump has always emphasized the core strategy of making America great again, entrusting his dream of reviving the United States. As long as the wall is built, the problems that have plagued the United States for many years, such as illegal immigrants and the proliferation of drugs, will be solved. But this idea is taken for granted and unrealistic.
Trump was a businessman before, and businessmen put their interests first. If he wants to be re-elected and remain as president of the United States, he must achieve results on the border wall issue. The role of the border wall is actually no longer important. It is a platform that he needs to fulfill his promise to show his determination to his supporters in exchange for the greatest benefits and allow himself to continue to be re-elected as president.
But if you want to build a border wall, funding is a major issue. If the U.S. House of Representatives does not approve an appropriation bill, if Trump cannot come up with enough money, then he will not be able to build the border wall. Possibly, his wish is destined to fail.