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President Trump threatens to shut U.S. border with Mexico permanently if migrant caravan is not deported
He called on Congress to fund his border wall, declaring that the caravan is 'not coming into the USA'
Migrants threw rocks and bottles that hit U.S. Border Patrol agents on Sunday at the San Ysidro Port of Entry
Border Patrol chief Carla Provost, told the Fox News Channel that 'our agents were being assaulted'
Officers responded by firing tear gas and rubber bullets into crowds of people as they neared the border
Forty-two made it across and were arrested, according to the chief border agent on the scene
He said on CNN that the mass of humanity are mostly economic migrants, not asylum-seekers
Tensions prompted U.S. officials to close the crossing between Tijuana and San Diego on Sunday
Trump's tweeted ultimatum played on TV screens Monday alongside images of screaming, coughing children
Homeland Security Secretary Kirstjen Nielsen said she would not put up with the 'lawlessness'
Mexico vowed Sunday to deport about 500 who tried to 'violently' and 'illegally' cross the border