He is already facing a dilemma about his proposal to issue work visas to the Central American migrants so they do not have to cross the border into the US.

Donald Trump defends use of tear gas at Mexico border

poll in El Universal, one of Mexico's largest newspapers, showed 52 per cent supported the idea while 40 per cent opposed it.

The poll stated 70 per cent of Mexicans had some sort of negative view about the migrant caravan.

Just about half supported blocking the migrants' entry into Mexico, which with this latest caravan was via a crossing point on the Suchiate River bordering Guatemala. Around 55 per cent supported the Mexican government taking harsher measures to prevent future caravans.

Support for the migrants has been declining even from their steadfast Mexican supporters.

With migrants feeling deflated after the tear gas clash, Mexico's National Human Rights Commission said it "reiterates that members of the caravans that cross our country should respect Mexican laws and not engage in actions that affect the communities they pass through." Support free-thinking journalism and subscribe to Independent Minds "It is important to note that the fact the Mexican government protects their rights does not imply a free pass to break the law," the group said in a rare moment of less than full-throated support for the migrants. A large part of the support issue is due to economics. For the six million people who live in the border region this could prove disastrous economically. Mr Trump has repeatedly threatened to close the San Ysidro port of entry near San Diego, California, and Tiajuana, Mexico. The San Ysidro port of entry has a more than $220 billion dollar economy passing through its gates. San Ysidro Chamber of Commerce on yesterday’s port of entry shutdown. pic.twitter.com/Xphgd4TkEt — Maya Srikrishnan (@msrikris) November 27, 2018 A statement issued by the local Chamber of Commerce said the temporary shutdown which occurred during the tear gas incident cost area businesses $5.3m (£4.2m). Approximately 25 million vehicles containing roughly 48 million passengers and more than 16 million pedestrians go between the U.S. and Mexico to go to work and school through that port every year, according to the Department of Transportation.

There are actually American troops stationed along the US-Mexico border. US border patrol agents were the ones who the tear gas, however.

Approximately 300 US troops stationed at the border in Texas and Arizona have now been given a new assignment in California, specifically around the San Ysidro port of entry near San Diego, California, and Tijuana, Mexico.

The move comes after US Customs and Border Protection asked the Pentagon for help to stop illegal immigration. According to the US military 2,400 troops are in Texas, 1,400 are in Arizona and 1,800 are currently in California.