Mr Trump has raised alarm over a group of thousands of migrants travelling through Mexico to the USA, saying: "Sadly, it looks like Mexico's Police and Military are unable to stop the Caravan". The caravan is now in southern Mexico.
Many nursed bleeding feet mangled by 10 days of walking almost 800 kilometers in plastic shoes or flip-flops. When asked about Trump's tweets critical of the caravan and his vows to keep them out, they have generally responded that he should stop attacking them and said they would keep trying to reach the United States.
Migrants told CNN they can not and will not turn around.
The caravan's numbers have continued to grow as they walk and hitch rides through hot and humid weather, and the United Nations estimated that it now comprises some 7,200 people, "many of whom intend to continue the march north".
Writing in capital letters, he appeared to say he wanted the laws changed but misspelled the word - typing that the laws "must be CHANDED".
US President Donald Trump said on Thursday he was "bringing out the military" to protectthe US border as a caravan of Central American migrants continued to trek through Mexico to the United States, but gave no other details.
Adding to the political tempest, Vice President Mike Pence said Tuesday that according to Honduran President Juan Orlando Hernandez, the caravan "was organized by leftist groups in Honduras financed by Venezuela and sent north to challenge our sovereignty".
In a statement to Business Insider, Alyssa Farah, press secretary for the vice president, said, "In 2017 alone the United States apprehended on average 10 suspected terrorists a day attempting to enter the country illegally".More news: Bollywood heartthrobs Deepika and Ranveer announce wedding date
ICE has been talking with contractors to discuss the possible need for additional detention capacity, according to the DHS official.
Many of them are parents with young children seeking a better life away from the violence and lack of opportunities in their home countries.
"Working in support of the Mexican authorities, our teams are providing staffing and technical help to ensure timely registration of asylum seekers, setting up identification and referral mechanisms for those with specific vulnerabilities and needs, and increasing assistance and shelter capacity", he noted. Instead of a clear policy or statement, the left simply snipes at President Trump, implying he is scare-mongering and dividing the country. By Monday evening the group had entered the eastern Guatemalan town of Chiquimula. Wednesday, officials said the number had dwindled from more than 7,000 to 4,500.
Another group of about 1,000 Hondurans has meanwhile started a separate march across Guatemala, headed for Mexico and then the United States.
An official from Mexico's Human Rights Commission said migrants can go through if they are in vans or trucks that offered them rides for free.
While Trump has sought to blame Democrats for undocumented immigration, such as the caravan, he has been unable to pass immigration reform legislation during his almost two years in office despite Republicans holding the Senate and the House of Representatives.
Humanitarian organizations estimate that one-fourth of the caravan's members are children, a representative of Save the Children told AFP.
"I'm not letting them in", he said during a bill signing in the Oval Office.