Former presidential candidate Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE on Monday slammed President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE for saying that due process should be eliminated for anyone that crosses the border illegally, suggesting that U.S. citizens could be next.

"Today the American president tweeted that there should be no judicial process, there should be no due process for anyone that crosses the border," Clinton said in a video shared by NTK Network. "And I can’t help but think if you strip immigrants and asylum-seekers of due process and judicial review: Who is next?"

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Clinton made the comment while speaking at Oxford University, just a day after Trump tweeted that immigrants who illegally cross the U.S.-Mexico border should be sent “back from where they came” without going through the judicial process in deportation cases.

“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,” Trump tweeted.

Trump's call came as he voiced his frustrations over an immigration system he believes is not strict enough. Despite signing an executive order last week to end the practice of separating families, he has continued to call for heightened border security.

His administration's "zero tolerance" policy at the border was responsible for more than 2,000 parents and children being separated from each other. It remains unclear how the government intends to reunite those families.

Clinton has repeatedly criticized Trump over his immigration policies. Last week she said that under Trump, fundamental rights "are under assault like never before."

"We are living through an era when fundamental rights, civic virtue, even facts and reason are under assault like never before. As we have been painfully reminded in my own country, the consequences are severe," Clinton said.