U.S. agents fired tear gas into the crowd, which included children, as a peaceful march turned into chaos.
"Border Patrol agents have fired gas on the southwest border before and there doesn't appear to be any law against it, but the more important question is whether such an action was necessary to maintain order and protect lives", said Alex Nowrasteh, an immigration policy analyst at the libertarian Cato Institute.
Rosie O'Donnell said the border clash was "pure horror" and called for the removal of President Trump.
He questioned why the Mexican government "allowed" the migrants to rush the border, as there was advance intelligence that it was going to happen.
"What I saw on the border yesterday was not people walking up to border control agents and asking to seek asylum", Scott said. In response, CBP deployed additional personnel to San Ysidro, California, on Sunday in expectation of demonstrations on both sides of the border.
Mario Figueroa - Tijuana's social services department director who is overseeing operations at the sports complex where most of the migrants in the caravan are staying - said as of Friday that of the 4,938 staying there, 933 were women, 889 were children and 3,105 were men, which includes fathers traveling with families along with single men.
US Customs and Border Protection officers "were struck by projectiles thrown by caravan members" and "perpetrators will be prosecuted", US Homeland Security Secretary Kirstjen Nielsen said on Twitter.
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The migrants, mainly from Honduras, are attempting to escape poverty and violence in their home country and said they would wait in Tijuana until they could request asylum in the US.
In November, President Trump announced a new rule that would bar immigrants illegally crossing the southern border from applying for asylum. "But you really say, why is a parent running up into an area where they know the tear gas is forming?"
Tijuana Mayor Juan Manuel Gastelum said the throngs of migrants who have descended on his city is tantamount to a humanitarian crisis, and he declared an emergency.
Senior officials of the incoming Mexican government are meeting on Sunday to discuss the plan, according a person familiar with the matter. Sarmiento said she had been near the bottom of the Tijuana River when us agents fired tear gas.
U.S. authorities needed to "minimize the level of force that is being used", he added.
Democrats in Congress want more comprehensive immigration reform in addition to additional border security, but strongly oppose Mr Trump's wall.