President Trump tweeted Sunday that people who "invade" the USA must get sent back to their home countries immediately, without any court action.
In a follow-up tweet, Trump said immigration policy in the United States is "laughed at all over the world", and "is very unfair to all of those people who have gone through the system legally and are waiting on line for years!"
In one tweet, he wrote, "We can not allow all of these people to invade our Country".
Trump said once "somebody comes in" the country, they should be removed with "no Judges or Court Cases" - a move that would violate the long-established legal precedent for immigrants' rights to due process. Our system is a mockery to good immigration policy and Law and Order.
He said it would address border security, protections for "Dreamers", family migration and the separation of children from their parents.
The House is expected to vote on immigration legislation this week, though its fate is uncertain.
The White House did not return a call seeking clarification. Earlier, Trump leaned once again on Democratic lawmakers to "fix" immigration laws and prevent people attempting to "break into" the US.
"We have people coming into the country, or trying to come in - we're stopping a lot of them", Mr. Trump said in the Cabinet Room during an hourlong meeting that reporters were allowed to document.
Mayors speak to the press outside the Tornillo Port of Entry where minors crossing the US-Mexico border without proper papers have been housed after being separated from adults, June 21, 2018 in Tornillo, Texas. Don't RESIST. We are doing a far better job than Bush and Obama, but we need strength and security at the Border! "These aren't people, these are animals, and we're taking them out of the country at a level and at a rate that's never happened before".
"Any official who has sworn an oath to uphold the Constitution and laws should disavow it unequivocally", Omar Jadwat, director of the ACLU's Immigrants' Rights Project said. "The president's suggestion that there is a ton of process for these individuals is simply wrong".
In most cases, they are allowed a full hearing before an immigration judge before being deported. At a Las Vegas political rally Saturday, he accused Democrats of backing "weak, weak borders", saying at one point: "I think I got elected largely because we are strong on the border". "You wouldn't believe how bad these people are".
Trump buckled to the pressure on Wednesday, issuing an executive order that ended the separations but the government has yet to reunite more than 2000 children with their parents.