Trump wants to send undocumented immigrants back without hearings

President Donald Trump pressed his case for cracking down on undocumented immigrants on Sunday, tweeting that "zero tolerance" is fair and gives preference to those who "legally wait their turn."

"We cannot allow all of these people to invade our Country," Trump said on Twitter. "When somebody comes in, we must immediately, with no Judges or Court Cases, bring them back from where they came. Our system is a mockery to good immigration policy and Law and Order."

Sen. Elizabeth Warren, D-Mass., visiting a processing center for undocumented immigrants on the Texas border, dismissed the implication that the migrants should be denied due process. A mother with a young child who faced threats from gangs and asks for asylum in the U.S. should not be rejected without a hearing, she said.

"That's not what our country stands for," she said. "We do have a system of laws."

Under zero tolerance, undocumented adult immigrants who did not cross at legal entry points are arrested and separated from their children. Trump's tweets Sunday came hours after federal officials released a plan to reunify migrant children with their parents in a mass detention center in Texas. The Department of Homeland Security said the reunifications may not happen until after a parent's deportation proceedings are complete.