Tear gas, rubber bullets in Tijuana, Trump threatens to close the border permanently
People have made the case that the "caravan" seeking to cross the border is more like a small army than a collection of refugees, economic or otherwise. This is a very debatable point and debate we will not engage in here.
It is worth noting however that these folks are trying to storm the border. They are seeking entry to the USA by force. If someone tried to come into one's house by force it is unlikely that you'd offer them a cup of tea. Even if the intruder had a very good case. (Which is not necessarily the case here.)
It is also worth noting that these migrants have allies in this country who would be more than happy to see the border with Mexico evaporate all together. There are many people who would like to see California (The Southwest) become something other than the USA. That is a fact, and one that has to be weighed honestly.
(From The Daily Mail)
President Trump threatened to permanently close the U.S. border with Mexico on Monday, saying he'll take the drastic action if members of a swelling migrant caravan are not deported back to their Central American homelands.
U.S. Border Patrol fired tear gas canisters and rubber bullets at a group of migrants on Sunday, including families with children as young as toddlers, as hundreds tried to storm the border.
The tensions prompted U.S. officials to close the crossing between Tijuana and San Diego, stopping thousands of people traveling legitimately between the U.S. and Mexico.