The people in this group do not come from any one place - they come from lots of different countries.
The majority of the new additions to the caravan in Mexico are migrants who previously entered the USA illegally but were deported, The Washington Post reported. "Of course the president has a lot of power, but they will have to explain it there to the different government structures".
The migrant caravan could number as many as 20,000 by the time it reaches the United States's southern border.
"I want to tell them they can count on us", said Lopez Obrador, who will take office in December, to a smattering of applause.
As a migrant caravan from Honduras appeared to be picking up increased numbers of people as it reached southern Mexico, President Donald Trump expressed alarm in a series of tweets and threatened to cut off aid to Central America.
Asked later for any evidence that there were terrorists walking with the caravan - Trump tweeted Monday that "Criminals and unknown Middle Easterners are mixed in" with the group - the President could provide none. I have alerted Border Patrol and Military that this is a National Emergy [sic].
President Donald Trump tweeted that he would end foreign aid to Guatemala, Honduras, and El Salvador over their inability or unwillingness to stop the caravan on its route to the US border.
President Trump has been incensed over the group of around 5,000 migrants, mainly Hondurans, who say they are fleeing violence, poverty, and corruption in their homeland. Numerous invaders are attempting to transit these countries and, in the process, are violating their sovereignty, their laws, and their procedures.
President Trump on Sunday called the caravan a "disgrace" and blamed Democrats, federal courts and the migrants themselves.
The denial rate for El Salvadorans seeking asylum in the USA was 79 per cent from 2012 to 2017, according to tracking by Syracuse University.
Guatemala received $176,928,403 from the U.S.in 2016.
"I have alerted Border patrol and Military that this is a National Emergency". Others who had a case for asylum would be allowed to make it. The US government's own foreign assistance website makes clear that the pledged aid, particularly to Honduras, is created to help combat "alarming levels of crime and violence", and treat "high levels of poverty and food insecurity and ineffective governance and corruption". The numbers for 2017 show that the US has given Honduras at least $144 million, and that number will likely rise as final reports are compiled.
Mr. Trump has been complaining about that situation for months.
Those proposals have not gotten traction among congressional Democrats, who view those changes as anti-immigrant.
Members of the caravan have vowed to press on, despite Trump's threat to close the border to them.
"At least four journalists travelling with the caravan have said they've seen nobody from the Middle East or heard of anybody from the Middle East", wrote Dale.
Migrants from Central America play football in the migrant shelter in Tenosique.
The Trump administration says that they support the Mexican government in their efforts to address this migration crisis.
It was clear though that more migrants were continuing to join the caravan.