The group mostly consisted of men, although some women pushed small children ahead in strollers.
Managing attorney for the Los Angeles office of legal rights organisation Human Rights First, Jenna Gilbert, said Mr Trump's new plan is "outright illegal, and I'm sure the administration will once more see itself in court".
Manuel Figueroa, who leads the city's social services department, said Tijuana was bringing in portable toilets and showers, as well as shampoo and soap.
Although the press, and in particular CNN, wish to treat this as a concotion of the administration, it seems the thousands of hopeful immigrants in the caravans, and the organizations supporting them, also take the situation very seriously and are taking action on that seriousness.
US officials have said for months that they were working with Mexico to find solutions for what they have called a border crisis. Meanwhile, since his soccer team can no longer practice at the complex, he was spending time passing out donated pizzas and roasted chicken to the migrants.
The president issued a proclamation earlier this month saying that only people who enter the U.S. at official checkpoints - as opposed to sneaking across the border - can apply for asylum. Even cities with few resources made sure the migrants had food and a place to rest. That changed this week as Donald Trump claimed all migrants will stay in Mexico until their claims are processed.
Trump has been seeking to block thousands of Central Americans traveling in caravans from entering the USA and has ordered that immigrants who enter the country illegally from Mexico are ineligible for asylum.
United States military helicopters have also been seen hovering over the Mexican side of the border.
White House spokesperson Hogan Gidley said: "President Trump has developed a strong relationship with the incoming (Lopez) Obrador Administration, and we look forward to working with them on a wide range of issues". Her children also were checked at a hospital and turned over to immigration authorities.
A Guatemalan woman was impaled by rebar when she attempted to enter the United States illegally Friday night. "All will stay in Mexico", the president wrote.
In fact, the border had to close temporarily at the crossing. Police cordoned off the streets around the crossing tangling traffic, but pedestrian traffic across the border continued uninterrupted Friday.
She said Mexico needs to examine how to accommodate the migrants without angering locals. About a dozen Mexican police stood by the crossing carrying plastic shields.