Summary
Trump announced plans to end birthright citizenship via executive action, despite its constitutional basis in the 14th Amendment.
He also outlined a mass deportation policy, starting with undocumented immigrants who committed crimes and potentially expanding to mixed-status families, who could face deportation as a unit.
Trump said he wants to avoid family separations but left the decision to families.
While doubling down on immigration restrictions, Trump expressed willingness to work with Democrats to create protections for Dreamers under DACA, citing their long-standing integration into U.S. society.
That didn’t stop them from deporting people to Mexico in the 30s. A senator at the time estimated that 60% of those who were removed from the country were US Citizens
https://en.m.wikipedia.org/wiki/Mexican_Repatriation
They can’t do that unless Mexico agrees. They can’t just drive people down to San Diego and then shove them into Tijuana.