Border patrol agents have stopped referring adult immigrants who cross the southern U.S. border illegally for criminal prosecution, raising questions about the future of the Trump administration’s “zero tolerance” policy.

The Associated Press reported Monday that Kevin McAleenan, the head of U.S. Customs and Border Protection, said he ordered his staff to halt referrals after 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 signed an executive order last week to stop the separation of migrant families.

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McAleenan said the zero tolerance policy is still in effect, but immigrants can’t be criminally prosecuted in the meantime because Trump halted the separation of families.

He added that he is developing a plan to resume prosecutions of those who enter the country illegally, the AP reported.

The Department of Justice implemented the controversial policy in April. Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE said immigrants who crossed the U.S.-Mexico border illegally would be criminally prosecuted. As a result of the policy, children would be separated from parents who were taken into custody.

Amid backlash from both sides of the aisle, Trump signed an executive order on Wednesday to stop family separations despite repeatedly claiming only Congress could address the issue.

The Department of Homeland Security has since confirmed it knows the location of each of the more than 2,000 children separated as a result of the policy and is working to reunite them with their families. However, the department did not lay out a timeline for when that might occur.